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Simplifying (x + 7)(x + -7) = x2 Reorder the terms: (7 + x)(x + -7) = x2 Reorder the terms: (7 + x)(-7 + x) = x2 Multiply (7 + x) * (-7 + x) (7(-7 + x) + x(-7 + x)) = x2 ((-7 * 7 + x * 7) + x(-7 + x)) = x2 ((-49 + 7x) + x(-7 + x)) = x2 (-49 + 7x + (-7 * x + x * x)) = x2 (-49 + 7x + (-7x + x2)) = x2 Combine like terms: 7x + -7x = 0 (-49 + 0 + x2) = x2 (-49 + x2) = x2 Add '-1x2' to each side of the equation. -49 + x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -49 + 0 = x2 + -1x2 -49 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -49 = 0 Solving -49 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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