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Simplifying 0 = (x + -3)(x + 3) Reorder the terms: 0 = (-3 + x)(x + 3) Reorder the terms: 0 = (-3 + x)(3 + x) Multiply (-3 + x) * (3 + x) 0 = (-3(3 + x) + x(3 + x)) 0 = ((3 * -3 + x * -3) + x(3 + x)) 0 = ((-9 + -3x) + x(3 + x)) 0 = (-9 + -3x + (3 * x + x * x)) 0 = (-9 + -3x + (3x + x2)) Combine like terms: -3x + 3x = 0 0 = (-9 + 0 + x2) 0 = (-9 + x2) Solving 0 = -9 + x2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x2' to each side of the equation. 0 + -1x2 = -9 + x2 + -1x2 Remove the zero: -1x2 = -9 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -1x2 = -9 + 0 -1x2 = -9 Divide each side by '-1'. x2 = 9 Simplifying x2 = 9 Take the square root of each side: x = {-3, 3}
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