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Simplifying (-2x2) + 9x + 15 = 0 Reorder the terms: 15 + 9x + (-2x2) = 0 Solving 15 + 9x + (-2x2) = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. -7.5 + -4.5x + x2 = 0 Move the constant term to the right: Add '7.5' to each side of the equation. -7.5 + -4.5x + 7.5 + x2 = 0 + 7.5 Reorder the terms: -7.5 + 7.5 + -4.5x + x2 = 0 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + -4.5x + x2 = 0 + 7.5 -4.5x + x2 = 0 + 7.5 Combine like terms: 0 + 7.5 = 7.5 -4.5x + x2 = 7.5 The x term is -4.5x. Take half its coefficient (-2.25). Square it (5.0625) and add it to both sides. Add '5.0625' to each side of the equation. -4.5x + 5.0625 + x2 = 7.5 + 5.0625 Reorder the terms: 5.0625 + -4.5x + x2 = 7.5 + 5.0625 Combine like terms: 7.5 + 5.0625 = 12.5625 5.0625 + -4.5x + x2 = 12.5625 Factor a perfect square on the left side: ((x) + -2.25)((x) + -2.25) = 12.5625 Calculate the square root of the right side: 3.54436172 Break this problem into two subproblems by setting ((x) + -2.25) equal to 3.54436172 and -3.54436172.Subproblem 1
(x) + -2.25 = 3.54436172 Simplifying (x) + -2.25 = 3.54436172 x + -2.25 = 3.54436172 Reorder the terms: -2.25 + x = 3.54436172 Solving -2.25 + x = 3.54436172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.54436172 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.54436172 + 2.25 x = 3.54436172 + 2.25 Combine like terms: 3.54436172 + 2.25 = 5.79436172 x = 5.79436172 Simplifying x = 5.79436172Subproblem 2
(x) + -2.25 = -3.54436172 Simplifying (x) + -2.25 = -3.54436172 x + -2.25 = -3.54436172 Reorder the terms: -2.25 + x = -3.54436172 Solving -2.25 + x = -3.54436172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.54436172 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.54436172 + 2.25 x = -3.54436172 + 2.25 Combine like terms: -3.54436172 + 2.25 = -1.29436172 x = -1.29436172 Simplifying x = -1.29436172Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.79436172, -1.29436172}
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