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Simplifying 55 = (x + 3)(x + -3) Reorder the terms: 55 = (3 + x)(x + -3) Reorder the terms: 55 = (3 + x)(-3 + x) Multiply (3 + x) * (-3 + x) 55 = (3(-3 + x) + x(-3 + x)) 55 = ((-3 * 3 + x * 3) + x(-3 + x)) 55 = ((-9 + 3x) + x(-3 + x)) 55 = (-9 + 3x + (-3 * x + x * x)) 55 = (-9 + 3x + (-3x + x2)) Combine like terms: 3x + -3x = 0 55 = (-9 + 0 + x2) 55 = (-9 + x2) Solving 55 = -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. 55 + -1x2 = -9 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 55 + -1x2 = -9 + 0 55 + -1x2 = -9 Add '-55' to each side of the equation. 55 + -55 + -1x2 = -9 + -55 Combine like terms: 55 + -55 = 0 0 + -1x2 = -9 + -55 -1x2 = -9 + -55 Combine like terms: -9 + -55 = -64 -1x2 = -64 Divide each side by '-1'. x2 = 64 Simplifying x2 = 64 Take the square root of each side: x = {-8, 8}
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