# 1條maths~~~~~~~

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- 魏王將張遼Lv 71 decade agoFavorite Answer
We have to solve it by completing square method:

y = -2x2 + 4x - 3

= -2(x2 - 2x) - 3

= -2(x2 - 2x + 1) - 3 + 2

= -2(x - 1)2 - 1

So the maximum of y occurs when x = 1 which is y = -1

So the vertex is at (1, -1)

Source(s): My Maths knowledge

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