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Simplifying -3x(x + 4) + 15 = 6 + -4x Reorder the terms: -3x(4 + x) + 15 = 6 + -4x (4 * -3x + x * -3x) + 15 = 6 + -4x (-12x + -3x2) + 15 = 6 + -4x Reorder the terms: 15 + -12x + -3x2 = 6 + -4x Solving 15 + -12x + -3x2 = 6 + -4x Solving for variable 'x'. Reorder the terms: 15 + -6 + -12x + 4x + -3x2 = 6 + -4x + -6 + 4x Combine like terms: 15 + -6 = 9 9 + -12x + 4x + -3x2 = 6 + -4x + -6 + 4x Combine like terms: -12x + 4x = -8x 9 + -8x + -3x2 = 6 + -4x + -6 + 4x Reorder the terms: 9 + -8x + -3x2 = 6 + -6 + -4x + 4x Combine like terms: 6 + -6 = 0 9 + -8x + -3x2 = 0 + -4x + 4x 9 + -8x + -3x2 = -4x + 4x Combine like terms: -4x + 4x = 0 9 + -8x + -3x2 = 0 Begin completing the square. Divide all terms by -3 the coefficient of the squared term: Divide each side by '-3'. -3 + 2.666666667x + x2 = 0 Move the constant term to the right: Add '3' to each side of the equation. -3 + 2.666666667x + 3 + x2 = 0 + 3 Reorder the terms: -3 + 3 + 2.666666667x + x2 = 0 + 3 Combine like terms: -3 + 3 = 0 0 + 2.666666667x + x2 = 0 + 3 2.666666667x + x2 = 0 + 3 Combine like terms: 0 + 3 = 3 2.666666667x + x2 = 3 The x term is 2.666666667x. Take half its coefficient (1.333333334). Square it (1.777777780) and add it to both sides. Add '1.777777780' to each side of the equation. 2.666666667x + 1.777777780 + x2 = 3 + 1.777777780 Reorder the terms: 1.777777780 + 2.666666667x + x2 = 3 + 1.777777780 Combine like terms: 3 + 1.777777780 = 4.77777778 1.777777780 + 2.666666667x + x2 = 4.77777778 Factor a perfect square on the left side: (x + 1.333333334)(x + 1.333333334) = 4.77777778 Calculate the square root of the right side: 2.185812842 Break this problem into two subproblems by setting (x + 1.333333334) equal to 2.185812842 and -2.185812842.Subproblem 1
x + 1.333333334 = 2.185812842 Simplifying x + 1.333333334 = 2.185812842 Reorder the terms: 1.333333334 + x = 2.185812842 Solving 1.333333334 + x = 2.185812842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 2.185812842 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 2.185812842 + -1.333333334 x = 2.185812842 + -1.333333334 Combine like terms: 2.185812842 + -1.333333334 = 0.852479508 x = 0.852479508 Simplifying x = 0.852479508Subproblem 2
x + 1.333333334 = -2.185812842 Simplifying x + 1.333333334 = -2.185812842 Reorder the terms: 1.333333334 + x = -2.185812842 Solving 1.333333334 + x = -2.185812842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -2.185812842 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -2.185812842 + -1.333333334 x = -2.185812842 + -1.333333334 Combine like terms: -2.185812842 + -1.333333334 = -3.519146176 x = -3.519146176 Simplifying x = -3.519146176Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.852479508, -3.519146176}
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