Question

Find f' and f''
y=(6x^5/5)-7x

Answer 1

\[y=\frac{ 6x^5 }{ 5 }-7x\]\[=\frac{ 6 }{ 5 }x^5-7x\]
Does it help if you can look at it like this maybe?

Both of these you need only apply the power rule, need some help with that? :D

Answer 2

f' of 6/5 x^5 is 6x^4 and f' of -7x is just 7 right?

Answer 3

very good :) one minor error, the derivative of -7x = -7

Answer 4

D'oh!! oh yea

Answer 5

gonna take a shot at f''? :D

Answer 6

so f'= -42x^5 + 6/5x^5 - 7?

Answer 7

whu? :o

Answer 8

\[f'(x)=6x^4-7\]
You already found this :)
now try to find f''(x).

Answer 9

f''= 24x^3

Answer 10

yay gj c:

Answer 11

thanks!! i have to remember that way to write the fraction, it was throwing me off