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Simplifying 5x2 + 20x + 18 = 0 Reorder the terms: 18 + 20x + 5x2 = 0 Solving 18 + 20x + 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'. 3.6 + 4x + x2 = 0 Move the constant term to the right: Add '-3.6' to each side of the equation. 3.6 + 4x + -3.6 + x2 = 0 + -3.6 Reorder the terms: 3.6 + -3.6 + 4x + x2 = 0 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + 4x + x2 = 0 + -3.6 4x + x2 = 0 + -3.6 Combine like terms: 0 + -3.6 = -3.6 4x + x2 = -3.6 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = -3.6 + 4 Reorder the terms: 4 + 4x + x2 = -3.6 + 4 Combine like terms: -3.6 + 4 = 0.4 4 + 4x + x2 = 0.4 Factor a perfect square on the left side: (x + 2)(x + 2) = 0.4 Calculate the square root of the right side: 0.632455532 Break this problem into two subproblems by setting (x + 2) equal to 0.632455532 and -0.632455532.Subproblem 1
x + 2 = 0.632455532 Simplifying x + 2 = 0.632455532 Reorder the terms: 2 + x = 0.632455532 Solving 2 + x = 0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0.632455532 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0.632455532 + -2 x = 0.632455532 + -2 Combine like terms: 0.632455532 + -2 = -1.367544468 x = -1.367544468 Simplifying x = -1.367544468Subproblem 2
x + 2 = -0.632455532 Simplifying x + 2 = -0.632455532 Reorder the terms: 2 + x = -0.632455532 Solving 2 + x = -0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -0.632455532 + -2 Combine like terms: 2 + -2 = 0 0 + x = -0.632455532 + -2 x = -0.632455532 + -2 Combine like terms: -0.632455532 + -2 = -2.632455532 x = -2.632455532 Simplifying x = -2.632455532Solution
The solution to the problem is based on the solutions from the subproblems. x = {-1.367544468, -2.632455532}
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