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Simplifying 3(x2 + -9) = 2x Reorder the terms: 3(-9 + x2) = 2x (-9 * 3 + x2 * 3) = 2x (-27 + 3x2) = 2x Solving -27 + 3x2 = 2x Solving for variable 'x'. Reorder the terms: -27 + -2x + 3x2 = 2x + -2x Combine like terms: 2x + -2x = 0 -27 + -2x + 3x2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -9 + -0.6666666667x + x2 = 0 Move the constant term to the right: Add '9' to each side of the equation. -9 + -0.6666666667x + 9 + x2 = 0 + 9 Reorder the terms: -9 + 9 + -0.6666666667x + x2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -0.6666666667x + x2 = 0 + 9 -0.6666666667x + x2 = 0 + 9 Combine like terms: 0 + 9 = 9 -0.6666666667x + x2 = 9 The x term is -0.6666666667x. Take half its coefficient (-0.3333333334). Square it (0.1111111112) and add it to both sides. Add '0.1111111112' to each side of the equation. -0.6666666667x + 0.1111111112 + x2 = 9 + 0.1111111112 Reorder the terms: 0.1111111112 + -0.6666666667x + x2 = 9 + 0.1111111112 Combine like terms: 9 + 0.1111111112 = 9.1111111112 0.1111111112 + -0.6666666667x + x2 = 9.1111111112 Factor a perfect square on the left side: (x + -0.3333333334)(x + -0.3333333334) = 9.1111111112 Calculate the square root of the right side: 3.018461713 Break this problem into two subproblems by setting (x + -0.3333333334) equal to 3.018461713 and -3.018461713.Subproblem 1
x + -0.3333333334 = 3.018461713 Simplifying x + -0.3333333334 = 3.018461713 Reorder the terms: -0.3333333334 + x = 3.018461713 Solving -0.3333333334 + x = 3.018461713 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 3.018461713 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 3.018461713 + 0.3333333334 x = 3.018461713 + 0.3333333334 Combine like terms: 3.018461713 + 0.3333333334 = 3.3517950464 x = 3.3517950464 Simplifying x = 3.3517950464Subproblem 2
x + -0.3333333334 = -3.018461713 Simplifying x + -0.3333333334 = -3.018461713 Reorder the terms: -0.3333333334 + x = -3.018461713 Solving -0.3333333334 + x = -3.018461713 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -3.018461713 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -3.018461713 + 0.3333333334 x = -3.018461713 + 0.3333333334 Combine like terms: -3.018461713 + 0.3333333334 = -2.6851283796 x = -2.6851283796 Simplifying x = -2.6851283796Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.3517950464, -2.6851283796}
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