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Simplifying 4x2 + 40x + 100 = 69 Reorder the terms: 100 + 40x + 4x2 = 69 Solving 100 + 40x + 4x2 = 69 Solving for variable 'x'. Reorder the terms: 100 + -69 + 40x + 4x2 = 69 + -69 Combine like terms: 100 + -69 = 31 31 + 40x + 4x2 = 69 + -69 Combine like terms: 69 + -69 = 0 31 + 40x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 7.75 + 10x + x2 = 0 Move the constant term to the right: Add '-7.75' to each side of the equation. 7.75 + 10x + -7.75 + x2 = 0 + -7.75 Reorder the terms: 7.75 + -7.75 + 10x + x2 = 0 + -7.75 Combine like terms: 7.75 + -7.75 = 0.00 0.00 + 10x + x2 = 0 + -7.75 10x + x2 = 0 + -7.75 Combine like terms: 0 + -7.75 = -7.75 10x + x2 = -7.75 The x term is 10x. Take half its coefficient (5). Square it (25) and add it to both sides. Add '25' to each side of the equation. 10x + 25 + x2 = -7.75 + 25 Reorder the terms: 25 + 10x + x2 = -7.75 + 25 Combine like terms: -7.75 + 25 = 17.25 25 + 10x + x2 = 17.25 Factor a perfect square on the left side: (x + 5)(x + 5) = 17.25 Calculate the square root of the right side: 4.153311931 Break this problem into two subproblems by setting (x + 5) equal to 4.153311931 and -4.153311931.Subproblem 1
x + 5 = 4.153311931 Simplifying x + 5 = 4.153311931 Reorder the terms: 5 + x = 4.153311931 Solving 5 + x = 4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 4.153311931 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.153311931 + -5 x = 4.153311931 + -5 Combine like terms: 4.153311931 + -5 = -0.846688069 x = -0.846688069 Simplifying x = -0.846688069Subproblem 2
x + 5 = -4.153311931 Simplifying x + 5 = -4.153311931 Reorder the terms: 5 + x = -4.153311931 Solving 5 + x = -4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -4.153311931 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.153311931 + -5 x = -4.153311931 + -5 Combine like terms: -4.153311931 + -5 = -9.153311931 x = -9.153311931 Simplifying x = -9.153311931Solution
The solution to the problem is based on the solutions from the subproblems. x = {-0.846688069, -9.153311931}
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