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Topic review (newest first)

bob bundy
2012-12-15 04:08:56

Yes that's right.

Bob

demha
2012-12-15 03:25:43

So the equation is

-x + -9x^2 then?

bob bundy
2012-12-13 22:54:41

Nearly

takes down the ^3 to ^2 which makes it 9^2(-1)

should be 9x^2(-1)

Bob

demha
2012-12-13 22:05:42

Wait, I think it just becomes x(-1)

27x^3(2x - 3) / 3x(3 2x)

(2x - 3) goes into (3 - 2x) -1 time. 3x goes into 27 9 times and takes down the ^3 to ^2 which makes it 9^2(-1)

-x + -9^2

Is that correct?

demha
2012-12-13 21:38:21

[3x^2(2x - 3) + 27x^3(2x - 3)] / [3x(3 2x)]

First one:
3x^2(2x - 3)/3x(3 2x)]

So since it is (2x - 3) and (3 - 2x), it goies into it but it becomes a -1? And as for the 3x^2 and 3x, would this becomes x^2?

bob bundy
2012-12-13 20:17:18

#5
[3(2x 3) x(2x 3)] / (2x - 3)

First fraction:
3(2x - 3)/(2x - 3)
(2x - 3) goes into (2x - 3) 1 time.
3(1)

Second fraction:
x(2x - 3)/(2x - 3)
(2x - 3) goes into (2x - 3) 1 time.
x(1)

Answer:
3 - x
correct!
#6
[x2(5x + 6) 3(5x + 6)] / (5x + 6)

First fraction:
x^2(5x + 6)/(5x + 6)
(5x + 6) goes into (5x + 6) 1 time.
x^2(1)

Second fraction:
3(5x + 6)/(5x + 6)
(5x + 6) goes into (5x + 6) 1 time.
3(1)

x^2 - 3
correct!
#7
[3x^2(2x - 3) + 27x^3(2x - 3)] / [3x(3 2x)]

This one seems a little confusing.







At this stage you can divide each part and then simplify. 

(3-2x) goes into (2x-3) exactly minus 1 times

Let's get this one finished and then we can look at 8 and 9. 


Bob

---

I also have two more having some trouble with:

8. 15x^7 45x^5 / 3x4


19. (3x 2)(x - 4) (x - 4)(6 5x) / (4 x)(8x 1)

demha
2012-12-13 19:59:09

#5
[3(2x 3) x(2x 3)] / (2x - 3)

First fraction:
3(2x - 3)/(2x - 3)
(2x - 3) goes into (2x - 3) 1 time.
3(1)

Second fraction:
x(2x - 3)/(2x - 3)
(2x - 3) goes into (2x - 3) 1 time.
x(1)

Answer:
3 - x

#6
[x2(5x + 6) 3(5x + 6)] / (5x + 6)

First fraction:
x^2(5x + 6)/(5x + 6)
(5x + 6) goes into (5x + 6) 1 time.
x^2(1)

Second fraction:
3(5x + 6)/(5x + 6)
(5x + 6) goes into (5x + 6) 1 time.
3(1)

x^2 - 3

#7
[3x^2(2x - 3) + 27x^3(2x - 3)] / [3x(3 2x)]

This one seems a little confusing.

---

I also have two more having some trouble with:

8. 15x^7 45x^5 / 3x4


19. (3x 2)(x - 4) (x - 4)(6 5x) / (4 x)(8x 1)

bob bundy
2012-12-13 19:19:59

Well done.

5, 6 and 7 are very similar to 4, so have a go and post your answers.

Bob

bobbym
2012-12-13 18:20:12

Hi;

Correct! Very good!

demha
2012-12-13 16:46:41

Glad to know I'm on the right track.
Second part of the equation:
3(x 1)/( x - 1)

Same way, (x - 1) goes into (x - 1) 1 time making it 3(1).

So now the equation is:
2 + 3 and the final answer will be 5.

Am I correct?

bob bundy
2012-12-13 03:47:06

yes.  first part is 2.

Bob

demha
2012-12-12 21:17:39

2(x 1) + 3(x 1) / (x 1)

2(x 1)/(x - 1) + 3(x 1)/( x - 1)

For the first fraction:
so (x - 1) goes into (x - 1) one time making it 2(1). Now I want to stop right here and make sure that I'm doing this right.

bob bundy
2012-12-12 20:07:20

hi demha

Q4.  Same method:



Bob

demha
2012-12-12 19:48:03

So how would you do number 4?

bobbym
2012-12-11 13:14:19

That is correct!

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