Question 326482
a.{{{y=x^2+8x+15}}}
{{{y=(x^2+8x+16)+15-16}}}
{{{highlight(y=(x+4)^2-1)}}}
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b.{{{y=-2x^2+12x-7}}}
{{{y=-2(x^2-6x)-7}}}
{{{y=-2(x^2-6x+9)-7+18}}}
{{{highlight(y=-2(x-3)^2+11)}}}