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Simplifying 9x + 15 + -16x2 = 0 Reorder the terms: 15 + 9x + -16x2 = 0 Solving 15 + 9x + -16x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -16 the coefficient of the squared term: Divide each side by '-16'. -0.9375 + -0.5625x + x2 = 0 Move the constant term to the right: Add '0.9375' to each side of the equation. -0.9375 + -0.5625x + 0.9375 + x2 = 0 + 0.9375 Reorder the terms: -0.9375 + 0.9375 + -0.5625x + x2 = 0 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + -0.5625x + x2 = 0 + 0.9375 -0.5625x + x2 = 0 + 0.9375 Combine like terms: 0 + 0.9375 = 0.9375 -0.5625x + x2 = 0.9375 The x term is -0.5625x. Take half its coefficient (-0.28125). Square it (0.0791015625) and add it to both sides. Add '0.0791015625' to each side of the equation. -0.5625x + 0.0791015625 + x2 = 0.9375 + 0.0791015625 Reorder the terms: 0.0791015625 + -0.5625x + x2 = 0.9375 + 0.0791015625 Combine like terms: 0.9375 + 0.0791015625 = 1.0166015625 0.0791015625 + -0.5625x + x2 = 1.0166015625 Factor a perfect square on the left side: (x + -0.28125)(x + -0.28125) = 1.0166015625 Calculate the square root of the right side: 1.008266613 Break this problem into two subproblems by setting (x + -0.28125) equal to 1.008266613 and -1.008266613.Subproblem 1
x + -0.28125 = 1.008266613 Simplifying x + -0.28125 = 1.008266613 Reorder the terms: -0.28125 + x = 1.008266613 Solving -0.28125 + x = 1.008266613 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.28125' to each side of the equation. -0.28125 + 0.28125 + x = 1.008266613 + 0.28125 Combine like terms: -0.28125 + 0.28125 = 0.00000 0.00000 + x = 1.008266613 + 0.28125 x = 1.008266613 + 0.28125 Combine like terms: 1.008266613 + 0.28125 = 1.289516613 x = 1.289516613 Simplifying x = 1.289516613Subproblem 2
x + -0.28125 = -1.008266613 Simplifying x + -0.28125 = -1.008266613 Reorder the terms: -0.28125 + x = -1.008266613 Solving -0.28125 + x = -1.008266613 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.28125' to each side of the equation. -0.28125 + 0.28125 + x = -1.008266613 + 0.28125 Combine like terms: -0.28125 + 0.28125 = 0.00000 0.00000 + x = -1.008266613 + 0.28125 x = -1.008266613 + 0.28125 Combine like terms: -1.008266613 + 0.28125 = -0.727016613 x = -0.727016613 Simplifying x = -0.727016613Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.289516613, -0.727016613}
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