putnamjaslyn putnamjaslyn

20-12-2017
Mathematics

contestada

What are the coordinates of the vertex of y=-x^2-8x+2?

A. (-4,2)
B. (-4,18)
C. (4,2)
D. (4,-46)

Respuesta :

tynollette tynollette

20-12-2017

the vertex is when x=-b/2a
in this case, b=-8, a=-1, so x=-(-8)/2(-1)=-4
when x=-4, y=-(-4)²-8(-4)+2=18
so the answer is B.

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