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Simplifying 16 = (x + -3)(x + 3) Reorder the terms: 16 = (-3 + x)(x + 3) Reorder the terms: 16 = (-3 + x)(3 + x) Multiply (-3 + x) * (3 + x) 16 = (-3(3 + x) + x(3 + x)) 16 = ((3 * -3 + x * -3) + x(3 + x)) 16 = ((-9 + -3x) + x(3 + x)) 16 = (-9 + -3x + (3 * x + x * x)) 16 = (-9 + -3x + (3x + x2)) Combine like terms: -3x + 3x = 0 16 = (-9 + 0 + x2) 16 = (-9 + x2) Solving 16 = -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. 16 + -1x2 = -9 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 16 + -1x2 = -9 + 0 16 + -1x2 = -9 Add '-16' to each side of the equation. 16 + -16 + -1x2 = -9 + -16 Combine like terms: 16 + -16 = 0 0 + -1x2 = -9 + -16 -1x2 = -9 + -16 Combine like terms: -9 + -16 = -25 -1x2 = -25 Divide each side by '-1'. x2 = 25 Simplifying x2 = 25 Take the square root of each side: x = {-5, 5}
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