C. (x+3)^2
Step-by-step explanation:
x²+6x+9 = 0
a = 1
b= 6
c = 9
Rewrite 6x as 3x + 3x
x^2 + 3x + 3x + 9
Factor out
x (x+3) + 3 (x+3)
Rewrite
(x+3) (x+3)
Combine
(x+3)^2
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