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Simplifying 2x2 + 18x = -9 Reorder the terms: 18x + 2x2 = -9 Solving 18x + 2x2 = -9 Solving for variable 'x'. Reorder the terms: 9 + 18x + 2x2 = -9 + 9 Combine like terms: -9 + 9 = 0 9 + 18x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 4.5 + 9x + x2 = 0 Move the constant term to the right: Add '-4.5' to each side of the equation. 4.5 + 9x + -4.5 + x2 = 0 + -4.5 Reorder the terms: 4.5 + -4.5 + 9x + x2 = 0 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + 9x + x2 = 0 + -4.5 9x + x2 = 0 + -4.5 Combine like terms: 0 + -4.5 = -4.5 9x + x2 = -4.5 The x term is 9x. Take half its coefficient (4.5). Square it (20.25) and add it to both sides. Add '20.25' to each side of the equation. 9x + 20.25 + x2 = -4.5 + 20.25 Reorder the terms: 20.25 + 9x + x2 = -4.5 + 20.25 Combine like terms: -4.5 + 20.25 = 15.75 20.25 + 9x + x2 = 15.75 Factor a perfect square on the left side: (x + 4.5)(x + 4.5) = 15.75 Calculate the square root of the right side: 3.968626967 Break this problem into two subproblems by setting (x + 4.5) equal to 3.968626967 and -3.968626967.Subproblem 1
x + 4.5 = 3.968626967 Simplifying x + 4.5 = 3.968626967 Reorder the terms: 4.5 + x = 3.968626967 Solving 4.5 + x = 3.968626967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 3.968626967 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 3.968626967 + -4.5 x = 3.968626967 + -4.5 Combine like terms: 3.968626967 + -4.5 = -0.531373033 x = -0.531373033 Simplifying x = -0.531373033Subproblem 2
x + 4.5 = -3.968626967 Simplifying x + 4.5 = -3.968626967 Reorder the terms: 4.5 + x = -3.968626967 Solving 4.5 + x = -3.968626967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -3.968626967 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -3.968626967 + -4.5 x = -3.968626967 + -4.5 Combine like terms: -3.968626967 + -4.5 = -8.468626967 x = -8.468626967 Simplifying x = -8.468626967Solution
The solution to the problem is based on the solutions from the subproblems. x = {-0.531373033, -8.468626967}
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