## anonymous 5 years ago Find the points of inflection. f(x) = 5x3 + 2x + 5

1. anonymous

You start by taking the first derivative. $f{\prime}(x)=15x ^{2}+2$ Then you solve it for zero. x^2=-2/15 Then your answers should be points of inflection.

2. anonymous

Isn't the first derivative 30x? so the point would be zero?

3. anonymous

No. You take the power off each x value and multiply it by the coefficient of x. Then you have to reduce the power of x by 1. Any constant just disappears

4. anonymous

thanks