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Simplifying 2x2 + -15x + 9 = 0 Reorder the terms: 9 + -15x + 2x2 = 0 Solving 9 + -15x + 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'. 4.5 + -7.5x + x2 = 0 Move the constant term to the right: Add '-4.5' to each side of the equation. 4.5 + -7.5x + -4.5 + x2 = 0 + -4.5 Reorder the terms: 4.5 + -4.5 + -7.5x + x2 = 0 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + -7.5x + x2 = 0 + -4.5 -7.5x + x2 = 0 + -4.5 Combine like terms: 0 + -4.5 = -4.5 -7.5x + x2 = -4.5 The x term is -7.5x. Take half its coefficient (-3.75). Square it (14.0625) and add it to both sides. Add '14.0625' to each side of the equation. -7.5x + 14.0625 + x2 = -4.5 + 14.0625 Reorder the terms: 14.0625 + -7.5x + x2 = -4.5 + 14.0625 Combine like terms: -4.5 + 14.0625 = 9.5625 14.0625 + -7.5x + x2 = 9.5625 Factor a perfect square on the left side: (x + -3.75)(x + -3.75) = 9.5625 Calculate the square root of the right side: 3.092329219 Break this problem into two subproblems by setting (x + -3.75) equal to 3.092329219 and -3.092329219.Subproblem 1
x + -3.75 = 3.092329219 Simplifying x + -3.75 = 3.092329219 Reorder the terms: -3.75 + x = 3.092329219 Solving -3.75 + x = 3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = 3.092329219 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 3.092329219 + 3.75 x = 3.092329219 + 3.75 Combine like terms: 3.092329219 + 3.75 = 6.842329219 x = 6.842329219 Simplifying x = 6.842329219Subproblem 2
x + -3.75 = -3.092329219 Simplifying x + -3.75 = -3.092329219 Reorder the terms: -3.75 + x = -3.092329219 Solving -3.75 + x = -3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = -3.092329219 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -3.092329219 + 3.75 x = -3.092329219 + 3.75 Combine like terms: -3.092329219 + 3.75 = 0.657670781 x = 0.657670781 Simplifying x = 0.657670781Solution
The solution to the problem is based on the solutions from the subproblems. x = {6.842329219, 0.657670781}
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