consider the function f(x)=2xexponent 2-20x-9 find the minimum or maximum value and determine where it occurs

Question

owlfred · Answer

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anonymous · Answer

$$f(x)=2x^2-20x-9$$ is a parabola facing up. has not max. min is at the vertex which is 
$$x=-\frac{b}{2a}=5$$

anonymous · Answer

that is not the minimum though, that is the x that gives it to you .  to find the minimum find 
$$f(5)=2\times 5^2-20\times 5-9$$
$$50-100-9$$
$$-59$$

anonymous · Answer

please tell me this is not a calculus problem but rather an algebra one yes?

anonymous · Answer

a algebra question and thank you