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Simplifying 9x2 + 18x + -79 = 0 Reorder the terms: -79 + 18x + 9x2 = 0 Solving -79 + 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'. -8.777777778 + 2x + x2 = 0 Move the constant term to the right: Add '8.777777778' to each side of the equation. -8.777777778 + 2x + 8.777777778 + x2 = 0 + 8.777777778 Reorder the terms: -8.777777778 + 8.777777778 + 2x + x2 = 0 + 8.777777778 Combine like terms: -8.777777778 + 8.777777778 = 0.000000000 0.000000000 + 2x + x2 = 0 + 8.777777778 2x + x2 = 0 + 8.777777778 Combine like terms: 0 + 8.777777778 = 8.777777778 2x + x2 = 8.777777778 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 = 8.777777778 + 1 Reorder the terms: 1 + 2x + x2 = 8.777777778 + 1 Combine like terms: 8.777777778 + 1 = 9.777777778 1 + 2x + x2 = 9.777777778 Factor a perfect square on the left side: (x + 1)(x + 1) = 9.777777778 Calculate the square root of the right side: 3.12694384 Break this problem into two subproblems by setting (x + 1) equal to 3.12694384 and -3.12694384.Subproblem 1
x + 1 = 3.12694384 Simplifying x + 1 = 3.12694384 Reorder the terms: 1 + x = 3.12694384 Solving 1 + x = 3.12694384 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 = 3.12694384 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.12694384 + -1 x = 3.12694384 + -1 Combine like terms: 3.12694384 + -1 = 2.12694384 x = 2.12694384 Simplifying x = 2.12694384Subproblem 2
x + 1 = -3.12694384 Simplifying x + 1 = -3.12694384 Reorder the terms: 1 + x = -3.12694384 Solving 1 + x = -3.12694384 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 = -3.12694384 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.12694384 + -1 x = -3.12694384 + -1 Combine like terms: -3.12694384 + -1 = -4.12694384 x = -4.12694384 Simplifying x = -4.12694384Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.12694384, -4.12694384}
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