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Simplifying (x + -9)(x + 9) = (x + -1)(x + -1) Reorder the terms: (-9 + x)(x + 9) = (x + -1)(x + -1) Reorder the terms: (-9 + x)(9 + x) = (x + -1)(x + -1) Multiply (-9 + x) * (9 + x) (-9(9 + x) + x(9 + x)) = (x + -1)(x + -1) ((9 * -9 + x * -9) + x(9 + x)) = (x + -1)(x + -1) ((-81 + -9x) + x(9 + x)) = (x + -1)(x + -1) (-81 + -9x + (9 * x + x * x)) = (x + -1)(x + -1) (-81 + -9x + (9x + x2)) = (x + -1)(x + -1) Combine like terms: -9x + 9x = 0 (-81 + 0 + x2) = (x + -1)(x + -1) (-81 + x2) = (x + -1)(x + -1) Reorder the terms: -81 + x2 = (-1 + x)(x + -1) Reorder the terms: -81 + x2 = (-1 + x)(-1 + x) Multiply (-1 + x) * (-1 + x) -81 + x2 = (-1(-1 + x) + x(-1 + x)) -81 + x2 = ((-1 * -1 + x * -1) + x(-1 + x)) -81 + x2 = ((1 + -1x) + x(-1 + x)) -81 + x2 = (1 + -1x + (-1 * x + x * x)) -81 + x2 = (1 + -1x + (-1x + x2)) Combine like terms: -1x + -1x = -2x -81 + x2 = (1 + -2x + x2) Add '-1x2' to each side of the equation. -81 + x2 + -1x2 = 1 + -2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -81 + 0 = 1 + -2x + x2 + -1x2 -81 = 1 + -2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -81 = 1 + -2x + 0 -81 = 1 + -2x Solving -81 = 1 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -81 + 2x = 1 + -2x + 2x Combine like terms: -2x + 2x = 0 -81 + 2x = 1 + 0 -81 + 2x = 1 Add '81' to each side of the equation. -81 + 81 + 2x = 1 + 81 Combine like terms: -81 + 81 = 0 0 + 2x = 1 + 81 2x = 1 + 81 Combine like terms: 1 + 81 = 82 2x = 82 Divide each side by '2'. x = 41 Simplifying x = 41
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