X= - 13, 1
x2 + 12x - 13 = 0, add 13 to both sides
x2 + 12x = 13, add 62 to both sides to complete the square
x2 + 12x + 62 = 49
(x + 6)2 = 49, take the square root to both sides
x + 6 = ± √49, subtract 6 to both sides
x = -6 ± 7
x = -6 + 7 = 1 or x = -6 - 7 = -13
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3
It equals 0. * * * * * Unless the question is (-x)2 + (+x)2. In that case, the answer is 2x2
Nonlinear
33
16-9+32=16