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Simplifying 15x2 + 4x + -9 = 0 Reorder the terms: -9 + 4x + 15x2 = 0 Solving -9 + 4x + 15x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 15 the coefficient of the squared term: Divide each side by '15'. -0.6 + 0.2666666667x + x2 = 0 Move the constant term to the right: Add '0.6' to each side of the equation. -0.6 + 0.2666666667x + 0.6 + x2 = 0 + 0.6 Reorder the terms: -0.6 + 0.6 + 0.2666666667x + x2 = 0 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + 0.2666666667x + x2 = 0 + 0.6 0.2666666667x + x2 = 0 + 0.6 Combine like terms: 0 + 0.6 = 0.6 0.2666666667x + x2 = 0.6 The x term is 0.2666666667x. Take half its coefficient (0.1333333334). Square it (0.01777777780) and add it to both sides. Add '0.01777777780' to each side of the equation. 0.2666666667x + 0.01777777780 + x2 = 0.6 + 0.01777777780 Reorder the terms: 0.01777777780 + 0.2666666667x + x2 = 0.6 + 0.01777777780 Combine like terms: 0.6 + 0.01777777780 = 0.6177777778 0.01777777780 + 0.2666666667x + x2 = 0.6177777778 Factor a perfect square on the left side: (x + 0.1333333334)(x + 0.1333333334) = 0.6177777778 Calculate the square root of the right side: 0.785988408 Break this problem into two subproblems by setting (x + 0.1333333334) equal to 0.785988408 and -0.785988408.Subproblem 1
x + 0.1333333334 = 0.785988408 Simplifying x + 0.1333333334 = 0.785988408 Reorder the terms: 0.1333333334 + x = 0.785988408 Solving 0.1333333334 + x = 0.785988408 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1333333334' to each side of the equation. 0.1333333334 + -0.1333333334 + x = 0.785988408 + -0.1333333334 Combine like terms: 0.1333333334 + -0.1333333334 = 0.0000000000 0.0000000000 + x = 0.785988408 + -0.1333333334 x = 0.785988408 + -0.1333333334 Combine like terms: 0.785988408 + -0.1333333334 = 0.6526550746 x = 0.6526550746 Simplifying x = 0.6526550746Subproblem 2
x + 0.1333333334 = -0.785988408 Simplifying x + 0.1333333334 = -0.785988408 Reorder the terms: 0.1333333334 + x = -0.785988408 Solving 0.1333333334 + x = -0.785988408 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1333333334' to each side of the equation. 0.1333333334 + -0.1333333334 + x = -0.785988408 + -0.1333333334 Combine like terms: 0.1333333334 + -0.1333333334 = 0.0000000000 0.0000000000 + x = -0.785988408 + -0.1333333334 x = -0.785988408 + -0.1333333334 Combine like terms: -0.785988408 + -0.1333333334 = -0.9193217414 x = -0.9193217414 Simplifying x = -0.9193217414Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.6526550746, -0.9193217414}
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