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Simplifying -3x2 + 11x + 21 = 0 Reorder the terms: 21 + 11x + -3x2 = 0 Solving 21 + 11x + -3x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -3 the coefficient of the squared term: Divide each side by '-3'. -7 + -3.666666667x + x2 = 0 Move the constant term to the right: Add '7' to each side of the equation. -7 + -3.666666667x + 7 + x2 = 0 + 7 Reorder the terms: -7 + 7 + -3.666666667x + x2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -3.666666667x + x2 = 0 + 7 -3.666666667x + x2 = 0 + 7 Combine like terms: 0 + 7 = 7 -3.666666667x + x2 = 7 The x term is -3.666666667x. Take half its coefficient (-1.833333334). Square it (3.361111114) and add it to both sides. Add '3.361111114' to each side of the equation. -3.666666667x + 3.361111114 + x2 = 7 + 3.361111114 Reorder the terms: 3.361111114 + -3.666666667x + x2 = 7 + 3.361111114 Combine like terms: 7 + 3.361111114 = 10.361111114 3.361111114 + -3.666666667x + x2 = 10.361111114 Factor a perfect square on the left side: (x + -1.833333334)(x + -1.833333334) = 10.361111114 Calculate the square root of the right side: 3.218867986 Break this problem into two subproblems by setting (x + -1.833333334) equal to 3.218867986 and -3.218867986.Subproblem 1
x + -1.833333334 = 3.218867986 Simplifying x + -1.833333334 = 3.218867986 Reorder the terms: -1.833333334 + x = 3.218867986 Solving -1.833333334 + x = 3.218867986 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.833333334' to each side of the equation. -1.833333334 + 1.833333334 + x = 3.218867986 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + x = 3.218867986 + 1.833333334 x = 3.218867986 + 1.833333334 Combine like terms: 3.218867986 + 1.833333334 = 5.05220132 x = 5.05220132 Simplifying x = 5.05220132Subproblem 2
x + -1.833333334 = -3.218867986 Simplifying x + -1.833333334 = -3.218867986 Reorder the terms: -1.833333334 + x = -3.218867986 Solving -1.833333334 + x = -3.218867986 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.833333334' to each side of the equation. -1.833333334 + 1.833333334 + x = -3.218867986 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + x = -3.218867986 + 1.833333334 x = -3.218867986 + 1.833333334 Combine like terms: -3.218867986 + 1.833333334 = -1.385534652 x = -1.385534652 Simplifying x = -1.385534652Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.05220132, -1.385534652}
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