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Simplifying 20 + 5x = 5x(x + -3) Reorder the terms: 20 + 5x = 5x(-3 + x) 20 + 5x = (-3 * 5x + x * 5x) 20 + 5x = (-15x + 5x2) Solving 20 + 5x = -15x + 5x2 Solving for variable 'x'. Combine like terms: 5x + 15x = 20x 20 + 20x + -5x2 = -15x + 5x2 + 15x + -5x2 Reorder the terms: 20 + 20x + -5x2 = -15x + 15x + 5x2 + -5x2 Combine like terms: -15x + 15x = 0 20 + 20x + -5x2 = 0 + 5x2 + -5x2 20 + 20x + -5x2 = 5x2 + -5x2 Combine like terms: 5x2 + -5x2 = 0 20 + 20x + -5x2 = 0 Factor out the Greatest Common Factor (GCF), '5'. 5(4 + 4x + -1x2) = 0 Ignore the factor 5.Subproblem 1
Set the factor '(4 + 4x + -1x2)' equal to zero and attempt to solve: Simplifying 4 + 4x + -1x2 = 0 Solving 4 + 4x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -4 + -4x + x2 = 0 Move the constant term to the right: Add '4' to each side of the equation. -4 + -4x + 4 + x2 = 0 + 4 Reorder the terms: -4 + 4 + -4x + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -4x + x2 = 0 + 4 -4x + x2 = 0 + 4 Combine like terms: 0 + 4 = 4 -4x + x2 = 4 The x term is -4x. Take half its coefficient (-2). Square it (4) and add it to both sides. Add '4' to each side of the equation. -4x + 4 + x2 = 4 + 4 Reorder the terms: 4 + -4x + x2 = 4 + 4 Combine like terms: 4 + 4 = 8 4 + -4x + x2 = 8 Factor a perfect square on the left side: (x + -2)(x + -2) = 8 Calculate the square root of the right side: 2.828427125 Break this problem into two subproblems by setting (x + -2) equal to 2.828427125 and -2.828427125.Subproblem 1
x + -2 = 2.828427125 Simplifying x + -2 = 2.828427125 Reorder the terms: -2 + x = 2.828427125 Solving -2 + x = 2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 2.828427125 + 2 Combine like terms: -2 + 2 = 0 0 + x = 2.828427125 + 2 x = 2.828427125 + 2 Combine like terms: 2.828427125 + 2 = 4.828427125 x = 4.828427125 Simplifying x = 4.828427125Subproblem 2
x + -2 = -2.828427125 Simplifying x + -2 = -2.828427125 Reorder the terms: -2 + x = -2.828427125 Solving -2 + x = -2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -2.828427125 + 2 Combine like terms: -2 + 2 = 0 0 + x = -2.828427125 + 2 x = -2.828427125 + 2 Combine like terms: -2.828427125 + 2 = -0.828427125 x = -0.828427125 Simplifying x = -0.828427125Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.828427125, -0.828427125}Solution
x = {4.828427125, -0.828427125}
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