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Simplifying (x + 9)(x + -9) = 0 Reorder the terms: (9 + x)(x + -9) = 0 Reorder the terms: (9 + x)(-9 + x) = 0 Multiply (9 + x) * (-9 + x) (9(-9 + x) + x(-9 + x)) = 0 ((-9 * 9 + x * 9) + x(-9 + x)) = 0 ((-81 + 9x) + x(-9 + x)) = 0 (-81 + 9x + (-9 * x + x * x)) = 0 (-81 + 9x + (-9x + x2)) = 0 Combine like terms: 9x + -9x = 0 (-81 + 0 + x2) = 0 (-81 + x2) = 0 Solving -81 + x2 = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + x2 = 0 + 81 Combine like terms: -81 + 81 = 0 0 + x2 = 0 + 81 x2 = 0 + 81 Combine like terms: 0 + 81 = 81 x2 = 81 Simplifying x2 = 81 Take the square root of each side: x = {-9, 9}
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