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Simplifying 9x2 + 18x + -11 = 0 Reorder the terms: -11 + 18x + 9x2 = 0 Solving -11 + 18x + 9x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. -1.222222222 + 2x + x2 = 0 Move the constant term to the right: Add '1.222222222' to each side of the equation. -1.222222222 + 2x + 1.222222222 + x2 = 0 + 1.222222222 Reorder the terms: -1.222222222 + 1.222222222 + 2x + x2 = 0 + 1.222222222 Combine like terms: -1.222222222 + 1.222222222 = 0.000000000 0.000000000 + 2x + x2 = 0 + 1.222222222 2x + x2 = 0 + 1.222222222 Combine like terms: 0 + 1.222222222 = 1.222222222 2x + x2 = 1.222222222 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = 1.222222222 + 1 Reorder the terms: 1 + 2x + x2 = 1.222222222 + 1 Combine like terms: 1.222222222 + 1 = 2.222222222 1 + 2x + x2 = 2.222222222 Factor a perfect square on the left side: (x + 1)(x + 1) = 2.222222222 Calculate the square root of the right side: 1.490711985 Break this problem into two subproblems by setting (x + 1) equal to 1.490711985 and -1.490711985.Subproblem 1
x + 1 = 1.490711985 Simplifying x + 1 = 1.490711985 Reorder the terms: 1 + x = 1.490711985 Solving 1 + x = 1.490711985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.490711985 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.490711985 + -1 x = 1.490711985 + -1 Combine like terms: 1.490711985 + -1 = 0.490711985 x = 0.490711985 Simplifying x = 0.490711985Subproblem 2
x + 1 = -1.490711985 Simplifying x + 1 = -1.490711985 Reorder the terms: 1 + x = -1.490711985 Solving 1 + x = -1.490711985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.490711985 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.490711985 + -1 x = -1.490711985 + -1 Combine like terms: -1.490711985 + -1 = -2.490711985 x = -2.490711985 Simplifying x = -2.490711985Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.490711985, -2.490711985}
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