Y=-x^2+10x-23 in vortex form
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The vertex-form of a quadratic equation is 
, where (h, k) is the vertex of the parabola.
To complete the square of a quadratic expression in standard form, we write the coefficient of x as 2*b, then add and subtract
.
so b=4, now add and subtract
.
To complete the square of a quadratic expression in standard form, we write the coefficient of x as 2*b, then add and subtract
so b=4, now add and subtract