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Simplifying 4x2 + 8x + -87 = 0 Reorder the terms: -87 + 8x + 4x2 = 0 Solving -87 + 8x + 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'. -21.75 + 2x + x2 = 0 Move the constant term to the right: Add '21.75' to each side of the equation. -21.75 + 2x + 21.75 + x2 = 0 + 21.75 Reorder the terms: -21.75 + 21.75 + 2x + x2 = 0 + 21.75 Combine like terms: -21.75 + 21.75 = 0.00 0.00 + 2x + x2 = 0 + 21.75 2x + x2 = 0 + 21.75 Combine like terms: 0 + 21.75 = 21.75 2x + x2 = 21.75 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 + x2 = 21.75 + 1 Reorder the terms: 1 + 2x + x2 = 21.75 + 1 Combine like terms: 21.75 + 1 = 22.75 1 + 2x + x2 = 22.75 Factor a perfect square on the left side: (x + 1)(x + 1) = 22.75 Calculate the square root of the right side: 4.769696007 Break this problem into two subproblems by setting (x + 1) equal to 4.769696007 and -4.769696007.Subproblem 1
x + 1 = 4.769696007 Simplifying x + 1 = 4.769696007 Reorder the terms: 1 + x = 4.769696007 Solving 1 + x = 4.769696007 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 = 4.769696007 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.769696007 + -1 x = 4.769696007 + -1 Combine like terms: 4.769696007 + -1 = 3.769696007 x = 3.769696007 Simplifying x = 3.769696007Subproblem 2
x + 1 = -4.769696007 Simplifying x + 1 = -4.769696007 Reorder the terms: 1 + x = -4.769696007 Solving 1 + x = -4.769696007 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 = -4.769696007 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.769696007 + -1 x = -4.769696007 + -1 Combine like terms: -4.769696007 + -1 = -5.769696007 x = -5.769696007 Simplifying x = -5.769696007Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.769696007, -5.769696007}
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