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so start with y = -x^2 + 5x + 7

then complete the square:

= -(x^2 -5x -7)

= -(x^2 -5x + 4/25 - 7 -4/25)

= -( (x-2/5)(x-2/5) -7 -4/25)

= -(x-2/5)^2 -(7 4/25)

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Q: What is -x2 plus 5x plus 7 in vertex form?
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