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Simplifying (x + 9)(x + 9) = 144 Reorder the terms: (9 + x)(x + 9) = 144 Reorder the terms: (9 + x)(9 + x) = 144 Multiply (9 + x) * (9 + x) (9(9 + x) + x(9 + x)) = 144 ((9 * 9 + x * 9) + x(9 + x)) = 144 ((81 + 9x) + x(9 + x)) = 144 (81 + 9x + (9 * x + x * x)) = 144 (81 + 9x + (9x + x2)) = 144 Combine like terms: 9x + 9x = 18x (81 + 18x + x2) = 144 Solving 81 + 18x + x2 = 144 Solving for variable 'x'. Reorder the terms: 81 + -144 + 18x + x2 = 144 + -144 Combine like terms: 81 + -144 = -63 -63 + 18x + x2 = 144 + -144 Combine like terms: 144 + -144 = 0 -63 + 18x + x2 = 0 Factor a trinomial. (-21 + -1x)(3 + -1x) = 0Subproblem 1
Set the factor '(-21 + -1x)' equal to zero and attempt to solve: Simplifying -21 + -1x = 0 Solving -21 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -1x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -1x = 0 + 21 -1x = 0 + 21 Combine like terms: 0 + 21 = 21 -1x = 21 Divide each side by '-1'. x = -21 Simplifying x = -21Subproblem 2
Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3Solution
x = {-21, 3}
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