## anonymous one year ago ind the derivative of f(x) = -4x2 + 11x at x = 10.

1. anonymous

i got -300 am i right?

2. DanJS

one rule for the powers $\frac{ d }{ dx }[a*x^n] = a*(n)x^{n-1}$

3. DanJS

The derivative of f(x) , at the point (10 , f(10)) , is the slope of a tangent line of f(x) through that point.

4. anonymous

wait so am i wrong?

5. DanJS

what did you get for the derivative f ' (x)

6. anonymous

well i got -300 as my final answer

7. DanJS

can you show the calculation to get that ...

8. anonymous

i honestly dont remeber, i think i used the (x+h)/h formula thing