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Simplifying 4x2 + -32x + -81 = 0 Reorder the terms: -81 + -32x + 4x2 = 0 Solving -81 + -32x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -20.25 + -8x + x2 = 0 Move the constant term to the right: Add '20.25' to each side of the equation. -20.25 + -8x + 20.25 + x2 = 0 + 20.25 Reorder the terms: -20.25 + 20.25 + -8x + x2 = 0 + 20.25 Combine like terms: -20.25 + 20.25 = 0.00 0.00 + -8x + x2 = 0 + 20.25 -8x + x2 = 0 + 20.25 Combine like terms: 0 + 20.25 = 20.25 -8x + x2 = 20.25 The x term is -8x. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8x + 16 + x2 = 20.25 + 16 Reorder the terms: 16 + -8x + x2 = 20.25 + 16 Combine like terms: 20.25 + 16 = 36.25 16 + -8x + x2 = 36.25 Factor a perfect square on the left side: (x + -4)(x + -4) = 36.25 Calculate the square root of the right side: 6.020797289 Break this problem into two subproblems by setting (x + -4) equal to 6.020797289 and -6.020797289.Subproblem 1
x + -4 = 6.020797289 Simplifying x + -4 = 6.020797289 Reorder the terms: -4 + x = 6.020797289 Solving -4 + x = 6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 6.020797289 + 4 Combine like terms: -4 + 4 = 0 0 + x = 6.020797289 + 4 x = 6.020797289 + 4 Combine like terms: 6.020797289 + 4 = 10.020797289 x = 10.020797289 Simplifying x = 10.020797289Subproblem 2
x + -4 = -6.020797289 Simplifying x + -4 = -6.020797289 Reorder the terms: -4 + x = -6.020797289 Solving -4 + x = -6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -6.020797289 + 4 Combine like terms: -4 + 4 = 0 0 + x = -6.020797289 + 4 x = -6.020797289 + 4 Combine like terms: -6.020797289 + 4 = -2.020797289 x = -2.020797289 Simplifying x = -2.020797289Solution
The solution to the problem is based on the solutions from the subproblems. x = {10.020797289, -2.020797289}
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