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#1 Help Me ! » rational expressions and functions » 2008-03-17 19:22:23

Replies: 1

first problem:
1 /(a-b)  - 3/(a+b)

2/(b-a)  +  4/(b+a)       

I've been working on it for over week and can't get the answer of (2b-a)/(a-3b) to work out?

second probelm:

(1-8x^-3)/(x^-1 +2x^-2 +4x^-3)  again a=have tried a million times and nothing loooks like the answer of x-2?

Please help I'm a back to college student after taking a 20 year break and can't remeber this stuff from before! Thanks to any and all. Heidi

#3 Re: Help Me ! » Solving the Equations with Square Roots(SQRT) » 2006-05-14 20:08:43

Thanks for the help but I used the wrong number after the = sign it should read

(Sqrt)of (3/2X-5) -10=-8 so I get
(sqrt) of (3/2x-5)=2 so then I get
3/2x-5=4 then
3/2x=9 then

Thanks a bunch for the help! K

#4 Help Me ! » Solving the Equations with Square Roots(SQRT) » 2006-05-14 19:32:02

Replies: 4

(Sqrt)of (3/2X-5) -10=(2/5)

I keep coming up with 6 but I don't think it's the right answer......Any help would be great ! Thanks to all.....
Happy Mother's Day to all the Mother's on here! wave

#5 Help Me ! » Multiplying adn dividing Radicals Help Pleaseeeeee! » 2006-05-10 18:37:59

Replies: 1

34. (sqrt)3{5(sqrt)s +(sqrt)3} I come up with 8(sqrt)6  am I on the right track or do I need to buy a whole new train??

38 {(sqrt)c +d}{3+(sqrt)5} I get 8(sqrt)6+3d+d(sqrt)5????

Last one 14/{60 -(sqrt)578} no idea where to start even??

Any and all help would be great but I'd rather get started in the right directions over just getting the answers...thank again! Adunno

#6 Re: Help Me ! » Solving Radical Equations » 2006-05-04 20:48:18

First ones answer is x= 8 and -9...corret ??? but the other one I can get anywher with is at alk..
I get this
(2x)(x+7) - (x) (3+3) = (y^2 -1)
then I get (2x^2 +14 x)(x-3x) = (y^2 -1) but then I keep getting zero on both side???? Help please!!!

#7 Help Me ! » Solving Radical Equations » 2006-05-04 19:57:25

Replies: 2

1. 8/(x+4) +1 = 5x/(x^2-2x-24)

2. 2x(x+3) -  x/(x+7) = (x^2-1)/(x^2+10x+21)

Any one able to show me where to start after figuring out the LDC would be my hero for the day!

The LDC for 1 is (x-6)(x+4)
and far 2 it's (x+3)(x+7) correct?

#8 Re: Help Me ! » math project!:) » 2006-05-01 17:49:13

I don't know what's allowed but the easiest way would be to take 1 or more of the 8's out?

#9 Help Me ! » Simplifiy the expression..please help dad says they all need more info » 2006-05-01 17:36:07

Replies: 5

I think I;ve got these right but mom's gone for the week and dad won't even look at math over 4th grade??? So please if any one could tell me if I have these right and just tell me which are wrong so I can try firguring the ones I have wrong again! APB   The instructions on 2-58 just say Simplifiy the Expression...

1.(x+3)/(x^3-x^2-6x) Divided by  ((x^2-9)/ x^2+x-12)= (x+4)/ (x)(x+2)(x-3)

2. (x^3+x^2)/(x^2-16)  *  (x+4)/(3x^4+x^3-2x^2) = 1/(x-4)

3.(12x-4)/(x-1)  +  (4x)/(x-1) = 48x

4. (5)/(2x^2)  + (4)/(3x)  =  (8x+15)/(6x^2)

5. (4)/(x+3)  +  (3x)/(x-2) = (3x^2+4x+1)/(x^2 +x-6) Should I simplifiy that down  to (3x+1)(x+1)/(x+3)(x-2) or not???

6. (5x+1)/(x-3) - (2x)/(x-1)  =  (7x^2-4x-3)/(x^2-4x+3)  I haven't broken it down as I can't tell if I;m suppose to?

I just gave them number 1-6 out of 56 I have done! The rest look right but these 6 I'm not sure on!

Again please just tell me if I'm right as I really want to figure them out by myself! Thanks... APB

#10 Re: Help Me ! » Solving Equations then tell which solution method you used! » 2006-04-06 00:57:07

What do the i's stand for? And if the sqrt = a negative number I thought it would's you do

#11 Help Me ! » Solving Equations then tell which solution method you used! » 2006-04-05 19:38:45

Replies: 5

T^2 -16T +65=0

I've tried the Quadratic formula
Factoring  and Graphin but  65 only factors are
1 *65  and
Any one have any ideas??? Please??? Mom's lost...and My son had left this problem after working on it for over an hour! Thanks Mom

#12 Re: Help Me ! » Factoring completely » 2006-04-05 18:35:00

Thanks a bunch I had just gotten the first one to work when stuck with multiplication but the second one I could get past the (T-1) Have a great day! Thanks again! Mom

#13 Help Me ! » Largest power of "K" problem...yikes » 2006-03-14 02:43:44

Replies: 2

What is the largest power k such as 3^k divides easily into 40? With out anyremainders?
a. 1
b. 4
c. 13
d. 17
e. none of these

I know a can't be right as 40 is to even of a number to be that only.
but do I use the k like tha other problem with 1/2^3, 1/2^4...and so on? Or is there another one???

#14 Help Me ! » sum of the solutions problem » 2006-03-14 01:06:02

Replies: 1

What is the sum of the solutions to 4^x -3 * 2^(x+2)

a. Log underscore 2(8/3)
b. 2
c. 5
d. -5
e. none of these

We've keep coming up wth b dunno

#15 Re: Help Me ! » Misc Math Problems » 2006-03-14 00:37:36

#2 should be this..
if a + bi is a complex number, let n[a+bi] = Sqrt (s^2 + b^2). What is n[(3+4i)^3]?

a. 625
b. 125
c. 5
d. Sqrt (91)
e. none of these

#18 Help Me ! » Computing 2 deteminant problem..... » 2006-03-13 17:02:34

Replies: 4

I can't get the lines to work right but I think you'll know what they are....

1.For what value of X is the folloing determinant NOT equal to 0?
       x+1        -2           -1
       0           x-2          -2
       0            0            x+3

Answer options
a. 1
b 2
c. -3
d. -1
e. none of these       I came up with d

2. Compute the following determinant:
        x-1     -2         -1
        -1      x-2       -2
         3         3        x+3

Answer options
a x^3 +3
b. x^3 + 6 x^2 - 9x + 33
c. X63 +14x +3
d. x^3 + 3
e. none of these                      Yes a and D are the same but I came up with c?dunno

#20 Help Me ! » 2 probablility questions » 2006-03-13 11:19:01

Replies: 3

1. Suppose a fair coin is tossed 7 times. How many ways are there to get exactly three heads or three tails?   I got B

Answer choices-
a. 7
b. 21
c. 35
d. 210
e. None of theese

2. Suppose three fair dice are thrown. What is the probabliity that the top faces will sum to 6?

a. 1
b. 1/6
c. 1/216
d. 5/108  MY ANSWER
e. Non of the these

Am I getting the right answer or do I need to redo it...again? K

#21 Help Me ! » Find sum of 100 terms in a sequence? » 2006-03-13 11:14:12

Replies: 4

My daughter had to miss math class for a music event and wants me to check her answers??? So here I am looking for help~

Find the sum of the first 100 terms of the aruthmetic sequence 19, 13 ,7,.....?  We came up with b

a. -58,100
b. -556
c. _27,800
d. -55,600
e. nnone of these

#22 Help Me ! » Misc Math Problems » 2006-03-13 07:43:59

Replies: 3

My daughter had to go to  music festival today so missed math test. she worked all weekend on the and asked me to look them over which I did but some of these  were over my I came here.

1. What is the average rate of change of f(x)=x^3-x in the interval {-2,2}?
a. 6
B. -3   THIS is her answer!
c. 3
d. 0
e. none of these

2. If a+bi is a complex number, llet {a+bi}=(sqrt)a^2+b^2. What is n[(3+4ai)^3]?
a. 625
d. (sqrt)91 which is 9
e. none of these   THIS is her answer!!!

3. What is the sum of the solutions of 4^x -3 *2^x=2 + 32=0?
a. log^UNDERSCORE 2 (8/3)
b.2  THIS is her answer!
c. 5
D. -5
e. none of these

4. X+Y+Z, wher (x,y,z) is the solutionto the following linear  system:

a. 7 This is her answer
b. 9
d. 1
e. none of these

5.Simplify the expression ln(81)+lm(27)+in(9) all over /  ln(27)-ln(9) + ln (3)

a. ln(117)/lm(21)
b. 9/2
c. 7ln(3)  This is here answer
d. 4.51
e. none of these

dunno hope I wrote these so you can understand them...thanks!

#23 Re: Help Me ! » one more problem 2 actully 2 » 2006-03-07 23:19:11

that's ok I figured thiem out now any way! and yeah my kids will be getting up soon to get ready for school...hopefully i'll have check all of these buy then! Thanks again!~ H

#24 Re: Help Me ! » using the quadriatic formula to solve! » 2006-03-07 22:58:39

Yeah I've tried that both ways but it seem easier for me?? Thanks agin! H

#25 Re: Help Me ! » using the quadriatic formula to solve! » 2006-03-07 22:49:07

I've been using a calculator only if I really need to use it?? I see where your showing me though? I have 2 more problems on a nother post can you please check them for me??? Thanks again, Heidi

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