Answer Happy

In Problems 7-10, find the critical point(s) and classify these by the second derivative test (you may use a calculator to plug in mumbers). If the test fails at a given value of x, simply note that the test fails at that point. 7: f(x)=−x3 8: g(x)=x3−12x+3 9:h(x)=4x3−6x2−72x+1