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Simplifying 4x(x + -2) = 100 Reorder the terms: 4x(-2 + x) = 100 (-2 * 4x + x * 4x) = 100 (-8x + 4x^{2}) = 100 Solving -8x + 4x^{2}= 100 Solving for variable 'x'. Reorder the terms: -100 + -8x + 4x^{2}= 100 + -100 Combine like terms: 100 + -100 = 0 -100 + -8x + 4x^{2}= 0 Factor out the Greatest Common Factor (GCF), '4'. 4(-25 + -2x + x^{2}) = 0 Ignore the factor 4.## Subproblem 1

Set the factor '(-25 + -2x + x^{2})' equal to zero and attempt to solve: Simplifying -25 + -2x + x^{2}= 0 Solving -25 + -2x + x^{2}= 0 Begin completing the square. Move the constant term to the right: Add '25' to each side of the equation. -25 + -2x + 25 + x^{2}= 0 + 25 Reorder the terms: -25 + 25 + -2x + x^{2}= 0 + 25 Combine like terms: -25 + 25 = 0 0 + -2x + x^{2}= 0 + 25 -2x + x^{2}= 0 + 25 Combine like terms: 0 + 25 = 25 -2x + x^{2}= 25 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x^{2}= 25 + 1 Reorder the terms: 1 + -2x + x^{2}= 25 + 1 Combine like terms: 25 + 1 = 26 1 + -2x + x^{2}= 26 Factor a perfect square on the left side: (x + -1)(x + -1) = 26 Calculate the square root of the right side: 5.099019514 Break this problem into two subproblems by setting (x + -1) equal to 5.099019514 and -5.099019514.## Subproblem 1

x + -1 = 5.099019514 Simplifying x + -1 = 5.099019514 Reorder the terms: -1 + x = 5.099019514 Solving -1 + x = 5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 5.099019514 + 1 Combine like terms: -1 + 1 = 0 0 + x = 5.099019514 + 1 x = 5.099019514 + 1 Combine like terms: 5.099019514 + 1 = 6.099019514 x = 6.099019514 Simplifying x = 6.099019514## Subproblem 2

x + -1 = -5.099019514 Simplifying x + -1 = -5.099019514 Reorder the terms: -1 + x = -5.099019514 Solving -1 + x = -5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -5.099019514 + 1 Combine like terms: -1 + 1 = 0 0 + x = -5.099019514 + 1 x = -5.099019514 + 1 Combine like terms: -5.099019514 + 1 = -4.099019514 x = -4.099019514 Simplifying x = -4.099019514## Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.099019514, -4.099019514}## Solution

x = {6.099019514, -4.099019514}

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