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Simplifying (x + 9) * x = 400 Reorder the terms: (9 + x) * x = 400 Reorder the terms for easier multiplication: x(9 + x) = 400 (9 * x + x * x) = 400 (9x + x2) = 400 Solving 9x + x2 = 400 Solving for variable 'x'. Reorder the terms: -400 + 9x + x2 = 400 + -400 Combine like terms: 400 + -400 = 0 -400 + 9x + x2 = 0 Factor a trinomial. (-25 + -1x)(16 + -1x) = 0Subproblem 1
Set the factor '(-25 + -1x)' equal to zero and attempt to solve: Simplifying -25 + -1x = 0 Solving -25 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + -1x = 0 + 25 Combine like terms: -25 + 25 = 0 0 + -1x = 0 + 25 -1x = 0 + 25 Combine like terms: 0 + 25 = 25 -1x = 25 Divide each side by '-1'. x = -25 Simplifying x = -25Subproblem 2
Set the factor '(16 + -1x)' equal to zero and attempt to solve: Simplifying 16 + -1x = 0 Solving 16 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + -1x = 0 + -16 Combine like terms: 16 + -16 = 0 0 + -1x = 0 + -16 -1x = 0 + -16 Combine like terms: 0 + -16 = -16 -1x = -16 Divide each side by '-1'. x = 16 Simplifying x = 16Solution
x = {-25, 16}
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