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Simplifying x2 + 18x + -21 = 0 Reorder the terms: -21 + 18x + x2 = 0 Solving -21 + 18x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '21' to each side of the equation. -21 + 18x + 21 + x2 = 0 + 21 Reorder the terms: -21 + 21 + 18x + x2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 18x + x2 = 0 + 21 18x + x2 = 0 + 21 Combine like terms: 0 + 21 = 21 18x + x2 = 21 The x term is 18x. Take half its coefficient (9). Square it (81) and add it to both sides. Add '81' to each side of the equation. 18x + 81 + x2 = 21 + 81 Reorder the terms: 81 + 18x + x2 = 21 + 81 Combine like terms: 21 + 81 = 102 81 + 18x + x2 = 102 Factor a perfect square on the left side: (x + 9)(x + 9) = 102 Calculate the square root of the right side: 10.099504938 Break this problem into two subproblems by setting (x + 9) equal to 10.099504938 and -10.099504938.Subproblem 1
x + 9 = 10.099504938 Simplifying x + 9 = 10.099504938 Reorder the terms: 9 + x = 10.099504938 Solving 9 + x = 10.099504938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 10.099504938 + -9 Combine like terms: 9 + -9 = 0 0 + x = 10.099504938 + -9 x = 10.099504938 + -9 Combine like terms: 10.099504938 + -9 = 1.099504938 x = 1.099504938 Simplifying x = 1.099504938Subproblem 2
x + 9 = -10.099504938 Simplifying x + 9 = -10.099504938 Reorder the terms: 9 + x = -10.099504938 Solving 9 + x = -10.099504938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -10.099504938 + -9 Combine like terms: 9 + -9 = 0 0 + x = -10.099504938 + -9 x = -10.099504938 + -9 Combine like terms: -10.099504938 + -9 = -19.099504938 x = -19.099504938 Simplifying x = -19.099504938Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.099504938, -19.099504938}
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