Question

Which of the following are true about the graph of f(x)=−4x2? Select the TWO that apply.

Answer 1

the answer is A and D

when you differentiate the question you find that the maximum point is (0,0)i.e

$\frac{dy}{dx} = - 8x$

when dy/dx is 0 values of x are 0,0

and the function shows that valies of x are real numbers.