Lsoldier5432 Lsoldier5432

10-04-2017
Mathematics

contestada

Find the vertex of the parabola whose equation is y = -2x2 + 8x - 5.

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ghanami ghanami

10-04-2017

hello :
y = -2x² + 8x - 5 = -2(x²-4x-5)
but : x²-4x = (x²-4x +2²)-2²
= (x-2)² -4
y = -2 ((x-2)²-9)
y = -2 (x-2)²+18
the vertex is A(2,18)

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