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Simplifying (x + -3)(x + -3) = (x2) + -81 Reorder the terms: (-3 + x)(x + -3) = (x2) + -81 Reorder the terms: (-3 + x)(-3 + x) = (x2) + -81 Multiply (-3 + x) * (-3 + x) (-3(-3 + x) + x(-3 + x)) = (x2) + -81 ((-3 * -3 + x * -3) + x(-3 + x)) = (x2) + -81 ((9 + -3x) + x(-3 + x)) = (x2) + -81 (9 + -3x + (-3 * x + x * x)) = (x2) + -81 (9 + -3x + (-3x + x2)) = (x2) + -81 Combine like terms: -3x + -3x = -6x (9 + -6x + x2) = (x2) + -81 9 + -6x + x2 = x2 + -81 Reorder the terms: 9 + -6x + x2 = -81 + x2 Add '-1x2' to each side of the equation. 9 + -6x + x2 + -1x2 = -81 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 + -6x + 0 = -81 + x2 + -1x2 9 + -6x = -81 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 + -6x = -81 + 0 9 + -6x = -81 Solving 9 + -6x = -81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -6x = -81 + -9 Combine like terms: 9 + -9 = 0 0 + -6x = -81 + -9 -6x = -81 + -9 Combine like terms: -81 + -9 = -90 -6x = -90 Divide each side by '-6'. x = 15 Simplifying x = 15
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