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Simplifying 400 = 80x + 4x2 Solving 400 = 80x + 4x2 Solving for variable 'x'. Reorder the terms: 400 + -80x + -4x2 = 80x + -80x + 4x2 + -4x2 Combine like terms: 80x + -80x = 0 400 + -80x + -4x2 = 0 + 4x2 + -4x2 400 + -80x + -4x2 = 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 400 + -80x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(100 + -20x + -1x2) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(100 + -20x + -1x2)' equal to zero and attempt to solve: Simplifying 100 + -20x + -1x2 = 0 Solving 100 + -20x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -100 + 20x + x2 = 0 Move the constant term to the right: Add '100' to each side of the equation. -100 + 20x + 100 + x2 = 0 + 100 Reorder the terms: -100 + 100 + 20x + x2 = 0 + 100 Combine like terms: -100 + 100 = 0 0 + 20x + x2 = 0 + 100 20x + x2 = 0 + 100 Combine like terms: 0 + 100 = 100 20x + x2 = 100 The x term is 20x. Take half its coefficient (10). Square it (100) and add it to both sides. Add '100' to each side of the equation. 20x + 100 + x2 = 100 + 100 Reorder the terms: 100 + 20x + x2 = 100 + 100 Combine like terms: 100 + 100 = 200 100 + 20x + x2 = 200 Factor a perfect square on the left side: (x + 10)(x + 10) = 200 Calculate the square root of the right side: 14.142135624 Break this problem into two subproblems by setting (x + 10) equal to 14.142135624 and -14.142135624.Subproblem 1
x + 10 = 14.142135624 Simplifying x + 10 = 14.142135624 Reorder the terms: 10 + x = 14.142135624 Solving 10 + x = 14.142135624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 14.142135624 + -10 Combine like terms: 10 + -10 = 0 0 + x = 14.142135624 + -10 x = 14.142135624 + -10 Combine like terms: 14.142135624 + -10 = 4.142135624 x = 4.142135624 Simplifying x = 4.142135624Subproblem 2
x + 10 = -14.142135624 Simplifying x + 10 = -14.142135624 Reorder the terms: 10 + x = -14.142135624 Solving 10 + x = -14.142135624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -14.142135624 + -10 Combine like terms: 10 + -10 = 0 0 + x = -14.142135624 + -10 x = -14.142135624 + -10 Combine like terms: -14.142135624 + -10 = -24.142135624 x = -24.142135624 Simplifying x = -24.142135624Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.142135624, -24.142135624}Solution
x = {4.142135624, -24.142135624}
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