## v.s 2 years ago Find the first and second derivative of the function. Check to see that your answers are reasonable by comparing the graphs of f, f ', and f ''. f(x) = 3x − 4x^7/8

1. v.s

f'(x)=$3-\frac{ 7 }{ 2 }x ^{-\frac{ 7 }{ 8 }}$

2. campbell_st

not quite the power of the derivative is (n - 1) in your question its (7/8 - 1)

3. v.s

-1/8

4. v.s

f''(x)= $\frac{ 7 }{ 16 }x ^{-\frac{ 9 }{ 8 }}$

5. campbell_st

looks ok... well done