2 Answers

Ithil · Answer 1 · 2018-07-13T02:56:58+0000

hello :
y = 9x²+9x-1
y = 9(x²+x)-1
y= 9(x²+2(1/2)x +(1/2)² -(1/2)² ) -1
y= 9((x+1/2 x)² -1/4) -1
y= 9(x+0.5)² -9/4 -1
y = 9(x+0.5)²-13/4......( vertex form)

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