Respuesta :

caylus
Hello,

Your equation has a mistake: it is y=-x²+6x-8.

y=-x²+6x-8
 =-(x²-6x)-8
 =-(x²-6x+9-9)-8
 =-(x-3)²+9-8
 =-(x-3)²+1

Vertex is (3,1)

An other way more speedy:
y=-x²+6x-8
y'=-2x+6 =0==>x=3 and y=-3²+6*3-8=1




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