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Complete the square on the following quadratic

x^2+22x+9=0

what value is added to both sides of the equation.

Respuesta :

msyatham
Subtract 9 on both sides. 

Then use the formula (b/2)^2 

(22/2)^2 = 121

So, factor x^2 +22x + 121 = -9+121

(x+11)^2 = 112 

X + 11 = √112 

X = √112 - 11

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