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Simplifying 5x2 + 7x + 56 = 70 Reorder the terms: 56 + 7x + 5x2 = 70 Solving 56 + 7x + 5x2 = 70 Solving for variable 'x'. Reorder the terms: 56 + -70 + 7x + 5x2 = 70 + -70 Combine like terms: 56 + -70 = -14 -14 + 7x + 5x2 = 70 + -70 Combine like terms: 70 + -70 = 0 -14 + 7x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -2.8 + 1.4x + x2 = 0 Move the constant term to the right: Add '2.8' to each side of the equation. -2.8 + 1.4x + 2.8 + x2 = 0 + 2.8 Reorder the terms: -2.8 + 2.8 + 1.4x + x2 = 0 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + 1.4x + x2 = 0 + 2.8 1.4x + x2 = 0 + 2.8 Combine like terms: 0 + 2.8 = 2.8 1.4x + x2 = 2.8 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 = 2.8 + 0.49 Reorder the terms: 0.49 + 1.4x + x2 = 2.8 + 0.49 Combine like terms: 2.8 + 0.49 = 3.29 0.49 + 1.4x + x2 = 3.29 Factor a perfect square on the left side: (x + 0.7)(x + 0.7) = 3.29 Calculate the square root of the right side: 1.813835715 Break this problem into two subproblems by setting (x + 0.7) equal to 1.813835715 and -1.813835715.Subproblem 1
x + 0.7 = 1.813835715 Simplifying x + 0.7 = 1.813835715 Reorder the terms: 0.7 + x = 1.813835715 Solving 0.7 + x = 1.813835715 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 = 1.813835715 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = 1.813835715 + -0.7 x = 1.813835715 + -0.7 Combine like terms: 1.813835715 + -0.7 = 1.113835715 x = 1.113835715 Simplifying x = 1.113835715Subproblem 2
x + 0.7 = -1.813835715 Simplifying x + 0.7 = -1.813835715 Reorder the terms: 0.7 + x = -1.813835715 Solving 0.7 + x = -1.813835715 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 = -1.813835715 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = -1.813835715 + -0.7 x = -1.813835715 + -0.7 Combine like terms: -1.813835715 + -0.7 = -2.513835715 x = -2.513835715 Simplifying x = -2.513835715Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.113835715, -2.513835715}
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