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Simplifying (x + -5)(x + 5) = x2 + -25 Reorder the terms: (-5 + x)(x + 5) = x2 + -25 Reorder the terms: (-5 + x)(5 + x) = x2 + -25 Multiply (-5 + x) * (5 + x) (-5(5 + x) + x(5 + x)) = x2 + -25 ((5 * -5 + x * -5) + x(5 + x)) = x2 + -25 ((-25 + -5x) + x(5 + x)) = x2 + -25 (-25 + -5x + (5 * x + x * x)) = x2 + -25 (-25 + -5x + (5x + x2)) = x2 + -25 Combine like terms: -5x + 5x = 0 (-25 + 0 + x2) = x2 + -25 (-25 + x2) = x2 + -25 Reorder the terms: -25 + x2 = -25 + x2 Add '25' to each side of the equation. -25 + 25 + x2 = -25 + 25 + x2 Combine like terms: -25 + 25 = 0 0 + x2 = -25 + 25 + x2 x2 = -25 + 25 + x2 Combine like terms: -25 + 25 = 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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