Which equation is y = 9x2 + 9x - 1 rewritten in vertex form?

a. y=9 (x + 1/2) ^2 - 13/4

b. y=9 (x + 1/2) ^2 - 1

c. y=9 (x + 1/2) ^2 + 5/4

d. y=9 (x + 1/2) ^2 - 5/4

Solve. 6666 times 234 + 122

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