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Simplifying (x + -3)(x + 3) = x2 + -9 Reorder the terms: (-3 + x)(x + 3) = x2 + -9 Reorder the terms: (-3 + x)(3 + x) = x2 + -9 Multiply (-3 + x) * (3 + x) (-3(3 + x) + x(3 + x)) = x2 + -9 ((3 * -3 + x * -3) + x(3 + x)) = x2 + -9 ((-9 + -3x) + x(3 + x)) = x2 + -9 (-9 + -3x + (3 * x + x * x)) = x2 + -9 (-9 + -3x + (3x + x2)) = x2 + -9 Combine like terms: -3x + 3x = 0 (-9 + 0 + x2) = x2 + -9 (-9 + x2) = x2 + -9 Reorder the terms: -9 + x2 = -9 + x2 Add '9' to each side of the equation. -9 + 9 + x2 = -9 + 9 + x2 Combine like terms: -9 + 9 = 0 0 + x2 = -9 + 9 + x2 x2 = -9 + 9 + x2 Combine like terms: -9 + 9 = 0 x2 = 0 + x2 x2 = x2 Add '-1x2' to each side of the equation. x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 0 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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