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Simplifying (4x2) + -1(18x) = 20 Remove parenthesis around (18x) (4x2) + -1 * 18x = 20 Multiply -1 * 18 (4x2) + -18x = 20 Reorder the terms: -18x + (4x2) = 20 Solving -18x + (4x2) = 20 Solving for variable 'x'. Reorder the terms: -20 + -18x + (4x2) = 20 + -20 Combine like terms: 20 + -20 = 0 -20 + -18x + (4x2) = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(-10 + -9x + (2x2)) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(-10 + -9x + (2x2))' equal to zero and attempt to solve: Simplifying -10 + -9x + (2x2) = 0 Solving -10 + -9x + (2x2) = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -5 + -4.5x + x2 = 0 Move the constant term to the right: Add '5' to each side of the equation. -5 + -4.5x + 5 + x2 = 0 + 5 Reorder the terms: -5 + 5 + -4.5x + x2 = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -4.5x + x2 = 0 + 5 -4.5x + x2 = 0 + 5 Combine like terms: 0 + 5 = 5 -4.5x + x2 = 5 The x term is -4.5x. Take half its coefficient (-2.25). Square it (5.0625) and add it to both sides. Add '5.0625' to each side of the equation. -4.5x + 5.0625 + x2 = 5 + 5.0625 Reorder the terms: 5.0625 + -4.5x + x2 = 5 + 5.0625 Combine like terms: 5 + 5.0625 = 10.0625 5.0625 + -4.5x + x2 = 10.0625 Factor a perfect square on the left side: ((x) + -2.25)((x) + -2.25) = 10.0625 Calculate the square root of the right side: 3.172144385 Break this problem into two subproblems by setting ((x) + -2.25) equal to 3.172144385 and -3.172144385.Subproblem 1
(x) + -2.25 = 3.172144385 Simplifying (x) + -2.25 = 3.172144385 x + -2.25 = 3.172144385 Reorder the terms: -2.25 + x = 3.172144385 Solving -2.25 + x = 3.172144385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.172144385 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.172144385 + 2.25 x = 3.172144385 + 2.25 Combine like terms: 3.172144385 + 2.25 = 5.422144385 x = 5.422144385 Simplifying x = 5.422144385Subproblem 2
(x) + -2.25 = -3.172144385 Simplifying (x) + -2.25 = -3.172144385 x + -2.25 = -3.172144385 Reorder the terms: -2.25 + x = -3.172144385 Solving -2.25 + x = -3.172144385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.172144385 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.172144385 + 2.25 x = -3.172144385 + 2.25 Combine like terms: -3.172144385 + 2.25 = -0.922144385 x = -0.922144385 Simplifying x = -0.922144385Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.422144385, -0.922144385}Solution
x = {5.422144385, -0.922144385}
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