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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
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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!