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Simplifying 0 = -4x2 + 1x + 7 Reorder the terms: 0 = 7 + 1x + -4x2 Solving 0 = 7 + 1x + -4x2 Solving for variable 'x'. Combine like terms: 0 + -7 = -7 -7 + -1x + 4x2 = 7 + 1x + -4x2 + -7 + -1x + 4x2 Reorder the terms: -7 + -1x + 4x2 = 7 + -7 + 1x + -1x + -4x2 + 4x2 Combine like terms: 7 + -7 = 0 -7 + -1x + 4x2 = 0 + 1x + -1x + -4x2 + 4x2 -7 + -1x + 4x2 = 1x + -1x + -4x2 + 4x2 Combine like terms: 1x + -1x = 0 -7 + -1x + 4x2 = 0 + -4x2 + 4x2 -7 + -1x + 4x2 = -4x2 + 4x2 Combine like terms: -4x2 + 4x2 = 0 -7 + -1x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -1.75 + -0.25x + x2 = 0 Move the constant term to the right: Add '1.75' to each side of the equation. -1.75 + -0.25x + 1.75 + x2 = 0 + 1.75 Reorder the terms: -1.75 + 1.75 + -0.25x + x2 = 0 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + -0.25x + x2 = 0 + 1.75 -0.25x + x2 = 0 + 1.75 Combine like terms: 0 + 1.75 = 1.75 -0.25x + x2 = 1.75 The x term is -0.25x. Take half its coefficient (-0.125). Square it (0.015625) and add it to both sides. Add '0.015625' to each side of the equation. -0.25x + 0.015625 + x2 = 1.75 + 0.015625 Reorder the terms: 0.015625 + -0.25x + x2 = 1.75 + 0.015625 Combine like terms: 1.75 + 0.015625 = 1.765625 0.015625 + -0.25x + x2 = 1.765625 Factor a perfect square on the left side: (x + -0.125)(x + -0.125) = 1.765625 Calculate the square root of the right side: 1.328768227 Break this problem into two subproblems by setting (x + -0.125) equal to 1.328768227 and -1.328768227.Subproblem 1
x + -0.125 = 1.328768227 Simplifying x + -0.125 = 1.328768227 Reorder the terms: -0.125 + x = 1.328768227 Solving -0.125 + x = 1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 1.328768227 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 1.328768227 + 0.125 x = 1.328768227 + 0.125 Combine like terms: 1.328768227 + 0.125 = 1.453768227 x = 1.453768227 Simplifying x = 1.453768227Subproblem 2
x + -0.125 = -1.328768227 Simplifying x + -0.125 = -1.328768227 Reorder the terms: -0.125 + x = -1.328768227 Solving -0.125 + x = -1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -1.328768227 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -1.328768227 + 0.125 x = -1.328768227 + 0.125 Combine like terms: -1.328768227 + 0.125 = -1.203768227 x = -1.203768227 Simplifying x = -1.203768227Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.453768227, -1.203768227}
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