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Simplifying -4x2 + 7x + 4 = 0 Reorder the terms: 4 + 7x + -4x2 = 0 Solving 4 + 7x + -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'. -1 + -1.75x + x2 = 0 Move the constant term to the right: Add '1' to each side of the equation. -1 + -1.75x + 1 + x2 = 0 + 1 Reorder the terms: -1 + 1 + -1.75x + x2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1.75x + x2 = 0 + 1 -1.75x + x2 = 0 + 1 Combine like terms: 0 + 1 = 1 -1.75x + x2 = 1 The x term is -1.75x. Take half its coefficient (-0.875). Square it (0.765625) and add it to both sides. Add '0.765625' to each side of the equation. -1.75x + 0.765625 + x2 = 1 + 0.765625 Reorder the terms: 0.765625 + -1.75x + x2 = 1 + 0.765625 Combine like terms: 1 + 0.765625 = 1.765625 0.765625 + -1.75x + x2 = 1.765625 Factor a perfect square on the left side: (x + -0.875)(x + -0.875) = 1.765625 Calculate the square root of the right side: 1.328768227 Break this problem into two subproblems by setting (x + -0.875) equal to 1.328768227 and -1.328768227.Subproblem 1
x + -0.875 = 1.328768227 Simplifying x + -0.875 = 1.328768227 Reorder the terms: -0.875 + x = 1.328768227 Solving -0.875 + x = 1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 1.328768227 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 1.328768227 + 0.875 x = 1.328768227 + 0.875 Combine like terms: 1.328768227 + 0.875 = 2.203768227 x = 2.203768227 Simplifying x = 2.203768227Subproblem 2
x + -0.875 = -1.328768227 Simplifying x + -0.875 = -1.328768227 Reorder the terms: -0.875 + x = -1.328768227 Solving -0.875 + x = -1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -1.328768227 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -1.328768227 + 0.875 x = -1.328768227 + 0.875 Combine like terms: -1.328768227 + 0.875 = -0.453768227 x = -0.453768227 Simplifying x = -0.453768227Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.203768227, -0.453768227}
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