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Simplifying 5x2 + 7x = 8 Reorder the terms: 7x + 5x2 = 8 Solving 7x + 5x2 = 8 Solving for variable 'x'. Reorder the terms: -8 + 7x + 5x2 = 8 + -8 Combine like terms: 8 + -8 = 0 -8 + 7x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -1.6 + 1.4x + x2 = 0 Move the constant term to the right: Add '1.6' to each side of the equation. -1.6 + 1.4x + 1.6 + x2 = 0 + 1.6 Reorder the terms: -1.6 + 1.6 + 1.4x + x2 = 0 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + 1.4x + x2 = 0 + 1.6 1.4x + x2 = 0 + 1.6 Combine like terms: 0 + 1.6 = 1.6 1.4x + x2 = 1.6 The x term is 1.4x. Take half its coefficient (0.7). Square it (0.49) and add it to both sides. Add '0.49' to each side of the equation. 1.4x + 0.49 + x2 = 1.6 + 0.49 Reorder the terms: 0.49 + 1.4x + x2 = 1.6 + 0.49 Combine like terms: 1.6 + 0.49 = 2.09 0.49 + 1.4x + x2 = 2.09 Factor a perfect square on the left side: (x + 0.7)(x + 0.7) = 2.09 Calculate the square root of the right side: 1.445683229 Break this problem into two subproblems by setting (x + 0.7) equal to 1.445683229 and -1.445683229.Subproblem 1
x + 0.7 = 1.445683229 Simplifying x + 0.7 = 1.445683229 Reorder the terms: 0.7 + x = 1.445683229 Solving 0.7 + x = 1.445683229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = 1.445683229 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = 1.445683229 + -0.7 x = 1.445683229 + -0.7 Combine like terms: 1.445683229 + -0.7 = 0.745683229 x = 0.745683229 Simplifying x = 0.745683229Subproblem 2
x + 0.7 = -1.445683229 Simplifying x + 0.7 = -1.445683229 Reorder the terms: 0.7 + x = -1.445683229 Solving 0.7 + x = -1.445683229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = -1.445683229 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = -1.445683229 + -0.7 x = -1.445683229 + -0.7 Combine like terms: -1.445683229 + -0.7 = -2.145683229 x = -2.145683229 Simplifying x = -2.145683229Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.745683229, -2.145683229}
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