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OpenStudy (anonymous):
derivative of y= (x^4+3x^2-2)^5
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OpenStudy (cwrw238):
you us ethe chain rule - are you familiar with this?
OpenStudy (anonymous):
f'(u^n) = nu'u(n-1)
F'(x) = 5 (4x^3 + 6x) (x^4 + 3x^2 -2)^4
OpenStudy (cwrw238):
[f(g(x)]' = f'g(x) * g'(x)
OpenStudy (anonymous):
but the answer in the bookis diff
OpenStudy (anonymous):
10 x (3+2 x^2) (-2+3 x^2+x^4)^4
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OpenStudy (anonymous):
i got your asnwers, but i dont undestnad how that becomes what the book says
OpenStudy (anonymous):
5(4x^3+6x)^4
(20x^3+30x)^4
(5*(x^4+3x^2-2)^4)*(4x^3+6x)
OpenStudy (cwrw238):
jordan's answer is correct but it can be simplidied
10x(2x^2 + 3)(x^4 + 3x^2 - 2)^4
OpenStudy (anonymous):
oh okay
OpenStudy (anonymous):
sorry about that
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OpenStudy (anonymous):
@cwrw238 how do u simplify it. can you do it step by step. i dont see how it becomes that final answer
OpenStudy (cwrw238):
the first part can be simplified
5(4x^3 + 6x)
take the part in the parentheses
the greatest common factor is 2x
right?
OpenStudy (anonymous):
oh. ya, okay.
OpenStudy (cwrw238):
so we can write it as 2x(2x^2 + 3)
OpenStudy (cwrw238):
this multiplied by the 5 gives
10x(2x^2 + 3)
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OpenStudy (anonymous):
thank you so much for your help!
OpenStudy (cwrw238):
yw
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