ok so for this question so far i have found out dy/dx

which is: 3- 20x^4 -15x^2

then im not sure how to show that as on the previous questions i was given a value to sub in.

thank you for the help.

 Dec 17, 2018

\(f'(x) = -3 - 20x^4 - 15x^2\\ \text{this should pretty clearly be less than zero for all }x\)

 Dec 17, 2018

oh right i forgot the - sign haha thank you for helping.

YEEEEEET  Dec 17, 2018

Before you ask more completely new questions take some time to digest what you have already been given.

 Dec 17, 2018

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