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Anna71 [15]
4 years ago
14

What number would u add to complete the square ? x^2+22x=9

Mathematics
1 answer:
Zinaida [17]4 years ago
5 0
To complete the square, take half of the coefficient of x, 22, square it, then add it to both sides of the equation.

x^2 + 22x = 9

22 / 2 = 11
11^2 = 121

x^2 + 22x + 121 = 9 + 121
x^2 + 22x + 121 = 130

Then you can go from there.
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