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Solve x2 − 12x + 23 = 0 by completing the square.

a (x − 12)2 = 23; x = −11, x = 35
b (x − 6)2 = 13; x = −7, x = 19
c (x − 12)2 = 23

User Pratik Roy
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1 Answer

5 votes

Answer:


{x}^(2) - 12x + 23 = 0


{x}^(2) - 12x = - 23


{x}^(2) - 12x + 36 = 13


{(x - 6)}^(2) = 13

x - 6 = +√13

x = 6 + √13

User Guilffer
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