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Simplifying 4x2 + 36x + -400 = 0 Reorder the terms: -400 + 36x + 4x2 = 0 Solving -400 + 36x + 4x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '4'. 4(-100 + 9x + x2) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(-100 + 9x + x2)' equal to zero and attempt to solve: Simplifying -100 + 9x + x2 = 0 Solving -100 + 9x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '100' to each side of the equation. -100 + 9x + 100 + x2 = 0 + 100 Reorder the terms: -100 + 100 + 9x + x2 = 0 + 100 Combine like terms: -100 + 100 = 0 0 + 9x + x2 = 0 + 100 9x + x2 = 0 + 100 Combine like terms: 0 + 100 = 100 9x + x2 = 100 The x term is 9x. Take half its coefficient (4.5). Square it (20.25) and add it to both sides. Add '20.25' to each side of the equation. 9x + 20.25 + x2 = 100 + 20.25 Reorder the terms: 20.25 + 9x + x2 = 100 + 20.25 Combine like terms: 100 + 20.25 = 120.25 20.25 + 9x + x2 = 120.25 Factor a perfect square on the left side: (x + 4.5)(x + 4.5) = 120.25 Calculate the square root of the right side: 10.9658561 Break this problem into two subproblems by setting (x + 4.5) equal to 10.9658561 and -10.9658561.Subproblem 1
x + 4.5 = 10.9658561 Simplifying x + 4.5 = 10.9658561 Reorder the terms: 4.5 + x = 10.9658561 Solving 4.5 + x = 10.9658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 10.9658561 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 10.9658561 + -4.5 x = 10.9658561 + -4.5 Combine like terms: 10.9658561 + -4.5 = 6.4658561 x = 6.4658561 Simplifying x = 6.4658561Subproblem 2
x + 4.5 = -10.9658561 Simplifying x + 4.5 = -10.9658561 Reorder the terms: 4.5 + x = -10.9658561 Solving 4.5 + x = -10.9658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -10.9658561 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -10.9658561 + -4.5 x = -10.9658561 + -4.5 Combine like terms: -10.9658561 + -4.5 = -15.4658561 x = -15.4658561 Simplifying x = -15.4658561Solution
The solution to the problem is based on the solutions from the subproblems. x = {6.4658561, -15.4658561}Solution
x = {6.4658561, -15.4658561}
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