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Simplifying 5x2 + -4x + -42 = 0 Reorder the terms: -42 + -4x + 5x2 = 0 Solving -42 + -4x + 5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -8.4 + -0.8x + x2 = 0 Move the constant term to the right: Add '8.4' to each side of the equation. -8.4 + -0.8x + 8.4 + x2 = 0 + 8.4 Reorder the terms: -8.4 + 8.4 + -0.8x + x2 = 0 + 8.4 Combine like terms: -8.4 + 8.4 = 0.0 0.0 + -0.8x + x2 = 0 + 8.4 -0.8x + x2 = 0 + 8.4 Combine like terms: 0 + 8.4 = 8.4 -0.8x + x2 = 8.4 The x term is -0.8x. Take half its coefficient (-0.4). Square it (0.16) and add it to both sides. Add '0.16' to each side of the equation. -0.8x + 0.16 + x2 = 8.4 + 0.16 Reorder the terms: 0.16 + -0.8x + x2 = 8.4 + 0.16 Combine like terms: 8.4 + 0.16 = 8.56 0.16 + -0.8x + x2 = 8.56 Factor a perfect square on the left side: (x + -0.4)(x + -0.4) = 8.56 Calculate the square root of the right side: 2.925747768 Break this problem into two subproblems by setting (x + -0.4) equal to 2.925747768 and -2.925747768.Subproblem 1
x + -0.4 = 2.925747768 Simplifying x + -0.4 = 2.925747768 Reorder the terms: -0.4 + x = 2.925747768 Solving -0.4 + x = 2.925747768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = 2.925747768 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 2.925747768 + 0.4 x = 2.925747768 + 0.4 Combine like terms: 2.925747768 + 0.4 = 3.325747768 x = 3.325747768 Simplifying x = 3.325747768Subproblem 2
x + -0.4 = -2.925747768 Simplifying x + -0.4 = -2.925747768 Reorder the terms: -0.4 + x = -2.925747768 Solving -0.4 + x = -2.925747768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = -2.925747768 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -2.925747768 + 0.4 x = -2.925747768 + 0.4 Combine like terms: -2.925747768 + 0.4 = -2.525747768 x = -2.525747768 Simplifying x = -2.525747768Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.325747768, -2.525747768}
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