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Simplifying 20x2 + 50x = 90 Reorder the terms: 50x + 20x2 = 90 Solving 50x + 20x2 = 90 Solving for variable 'x'. Reorder the terms: -90 + 50x + 20x2 = 90 + -90 Combine like terms: 90 + -90 = 0 -90 + 50x + 20x2 = 0 Factor out the Greatest Common Factor (GCF), '10'. 10(-9 + 5x + 2x2) = 0 Ignore the factor 10.Subproblem 1
Set the factor '(-9 + 5x + 2x2)' equal to zero and attempt to solve: Simplifying -9 + 5x + 2x2 = 0 Solving -9 + 5x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -4.5 + 2.5x + x2 = 0 Move the constant term to the right: Add '4.5' to each side of the equation. -4.5 + 2.5x + 4.5 + x2 = 0 + 4.5 Reorder the terms: -4.5 + 4.5 + 2.5x + x2 = 0 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + 2.5x + x2 = 0 + 4.5 2.5x + x2 = 0 + 4.5 Combine like terms: 0 + 4.5 = 4.5 2.5x + x2 = 4.5 The x term is 2.5x. Take half its coefficient (1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. 2.5x + 1.5625 + x2 = 4.5 + 1.5625 Reorder the terms: 1.5625 + 2.5x + x2 = 4.5 + 1.5625 Combine like terms: 4.5 + 1.5625 = 6.0625 1.5625 + 2.5x + x2 = 6.0625 Factor a perfect square on the left side: (x + 1.25)(x + 1.25) = 6.0625 Calculate the square root of the right side: 2.46221445 Break this problem into two subproblems by setting (x + 1.25) equal to 2.46221445 and -2.46221445.Subproblem 1
x + 1.25 = 2.46221445 Simplifying x + 1.25 = 2.46221445 Reorder the terms: 1.25 + x = 2.46221445 Solving 1.25 + x = 2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 2.46221445 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 2.46221445 + -1.25 x = 2.46221445 + -1.25 Combine like terms: 2.46221445 + -1.25 = 1.21221445 x = 1.21221445 Simplifying x = 1.21221445Subproblem 2
x + 1.25 = -2.46221445 Simplifying x + 1.25 = -2.46221445 Reorder the terms: 1.25 + x = -2.46221445 Solving 1.25 + x = -2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -2.46221445 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -2.46221445 + -1.25 x = -2.46221445 + -1.25 Combine like terms: -2.46221445 + -1.25 = -3.71221445 x = -3.71221445 Simplifying x = -3.71221445Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.21221445, -3.71221445}Solution
x = {1.21221445, -3.71221445}
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