Question

find the second derivatives of y = x^3(2x + 4)^2
a. 2x + 4
b. x^3(2x+80)
c. x^2(80x +192)
d. x^2(20x+60)

Answer 1

a?

Answer 2

sometime my prof answer is E but this one i feel there a answer

Answer 3

c or d

Answer 4

wait im working it out.

Answer 5

hmm i worked it out, i got 80x^3 +192x^2 +96x which doesnt fit anything above. i thought i was wrong, so i double checked on the calc.
http://www.wolframalpha.com/input/?i=+second+derivative+x^3%282x+%2B+4%29^2
it gave the same answer also...

Answer 6

thanks