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Simplifying (r + 1)(r + 1) + (r + -8)(r + -8) = 45 Reorder the terms: (1 + r)(r + 1) + (r + -8)(r + -8) = 45 Reorder the terms: (1 + r)(1 + r) + (r + -8)(r + -8) = 45 Multiply (1 + r) * (1 + r) (1(1 + r) + r(1 + r)) + (r + -8)(r + -8) = 45 ((1 * 1 + r * 1) + r(1 + r)) + (r + -8)(r + -8) = 45 ((1 + 1r) + r(1 + r)) + (r + -8)(r + -8) = 45 (1 + 1r + (1 * r + r * r)) + (r + -8)(r + -8) = 45 (1 + 1r + (1r + r2)) + (r + -8)(r + -8) = 45 Combine like terms: 1r + 1r = 2r (1 + 2r + r2) + (r + -8)(r + -8) = 45 Reorder the terms: 1 + 2r + r2 + (-8 + r)(r + -8) = 45 Reorder the terms: 1 + 2r + r2 + (-8 + r)(-8 + r) = 45 Multiply (-8 + r) * (-8 + r) 1 + 2r + r2 + (-8(-8 + r) + r(-8 + r)) = 45 1 + 2r + r2 + ((-8 * -8 + r * -8) + r(-8 + r)) = 45 1 + 2r + r2 + ((64 + -8r) + r(-8 + r)) = 45 1 + 2r + r2 + (64 + -8r + (-8 * r + r * r)) = 45 1 + 2r + r2 + (64 + -8r + (-8r + r2)) = 45 Combine like terms: -8r + -8r = -16r 1 + 2r + r2 + (64 + -16r + r2) = 45 Reorder the terms: 1 + 64 + 2r + -16r + r2 + r2 = 45 Combine like terms: 1 + 64 = 65 65 + 2r + -16r + r2 + r2 = 45 Combine like terms: 2r + -16r = -14r 65 + -14r + r2 + r2 = 45 Combine like terms: r2 + r2 = 2r2 65 + -14r + 2r2 = 45 Solving 65 + -14r + 2r2 = 45 Solving for variable 'r'. Reorder the terms: 65 + -45 + -14r + 2r2 = 45 + -45 Combine like terms: 65 + -45 = 20 20 + -14r + 2r2 = 45 + -45 Combine like terms: 45 + -45 = 0 20 + -14r + 2r2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(10 + -7r + r2) = 0 Factor a trinomial. 2((2 + -1r)(5 + -1r)) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(2 + -1r)' equal to zero and attempt to solve: Simplifying 2 + -1r = 0 Solving 2 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1r = 0 + -2 -1r = 0 + -2 Combine like terms: 0 + -2 = -2 -1r = -2 Divide each side by '-1'. r = 2 Simplifying r = 2Subproblem 2
Set the factor '(5 + -1r)' equal to zero and attempt to solve: Simplifying 5 + -1r = 0 Solving 5 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1r = 0 + -5 -1r = 0 + -5 Combine like terms: 0 + -5 = -5 -1r = -5 Divide each side by '-1'. r = 5 Simplifying r = 5Solution
r = {2, 5}
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