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Simplifying (x + -2)(x + 2) = x2 + -4 Reorder the terms: (-2 + x)(x + 2) = x2 + -4 Reorder the terms: (-2 + x)(2 + x) = x2 + -4 Multiply (-2 + x) * (2 + x) (-2(2 + x) + x(2 + x)) = x2 + -4 ((2 * -2 + x * -2) + x(2 + x)) = x2 + -4 ((-4 + -2x) + x(2 + x)) = x2 + -4 (-4 + -2x + (2 * x + x * x)) = x2 + -4 (-4 + -2x + (2x + x2)) = x2 + -4 Combine like terms: -2x + 2x = 0 (-4 + 0 + x2) = x2 + -4 (-4 + x2) = x2 + -4 Reorder the terms: -4 + x2 = -4 + x2 Add '4' to each side of the equation. -4 + 4 + x2 = -4 + 4 + x2 Combine like terms: -4 + 4 = 0 0 + x2 = -4 + 4 + x2 x2 = -4 + 4 + x2 Combine like terms: -4 + 4 = 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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