- #1

- 27

- 0

4(x^2-1)^3(2x)(2-3x)+(x^2-1)^4(-3)

have i done something wrong here because i never get the right answer with these ones i dont know if i messed up here or later on

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- Thread starter dcgirl16
- Start date

- #1

- 27

- 0

4(x^2-1)^3(2x)(2-3x)+(x^2-1)^4(-3)

have i done something wrong here because i never get the right answer with these ones i dont know if i messed up here or later on

- #2

cristo

Staff Emeritus

Science Advisor

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You evaluation of the derivative is correct.

- #3

- 27

- 0

(8x)(x^2-1)^3(2-3x)+(x^2-1)(-3)

is this still right?

- #4

- 27

- 0

i should have a 1 in there before the plus sign too

- #5

cristo

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Science Advisor

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- #6

- 27

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would it be

((x^2-1)^3)(1)(8X)(2-3X)+(x^2-1)(-3) ?

((x^2-1)^3)(1)(8X)(2-3X)+(x^2-1)(-3) ?

- #7

cristo

Staff Emeritus

Science Advisor

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(x^2-1)^3(8x(2-3x)-3(x^2-1)).

Now, can you simplify this?

- #8

- 27

- 0

my first thought would be to multiple the 8x and -3 through their brackets then combine like terms?

- #9

cristo

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Science Advisor

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my first thought would be to multiple the 8x and -3 through their brackets then combine like terms?

Good idea. Give it a go and see what you come up with.

- #10

- 27

- 0

ok that workedi got the right answer thanks for your help

- #11

cristo

Staff Emeritus

Science Advisor

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- 73

You're very welcome!

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