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Simplifying 3a2 + 8a + -72 = 0 Reorder the terms: -72 + 8a + 3a2 = 0 Solving -72 + 8a + 3a2 = 0 Solving for variable 'a'. Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -24 + 2.666666667a + a2 = 0 Move the constant term to the right: Add '24' to each side of the equation. -24 + 2.666666667a + 24 + a2 = 0 + 24 Reorder the terms: -24 + 24 + 2.666666667a + a2 = 0 + 24 Combine like terms: -24 + 24 = 0 0 + 2.666666667a + a2 = 0 + 24 2.666666667a + a2 = 0 + 24 Combine like terms: 0 + 24 = 24 2.666666667a + a2 = 24 The a term is 2.666666667a. 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. 2.666666667a + 1.777777780 + a2 = 24 + 1.777777780 Reorder the terms: 1.777777780 + 2.666666667a + a2 = 24 + 1.777777780 Combine like terms: 24 + 1.777777780 = 25.77777778 1.777777780 + 2.666666667a + a2 = 25.77777778 Factor a perfect square on the left side: (a + 1.333333334)(a + 1.333333334) = 25.77777778 Calculate the square root of the right side: 5.077182071 Break this problem into two subproblems by setting (a + 1.333333334) equal to 5.077182071 and -5.077182071.Subproblem 1
a + 1.333333334 = 5.077182071 Simplifying a + 1.333333334 = 5.077182071 Reorder the terms: 1.333333334 + a = 5.077182071 Solving 1.333333334 + a = 5.077182071 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + a = 5.077182071 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + a = 5.077182071 + -1.333333334 a = 5.077182071 + -1.333333334 Combine like terms: 5.077182071 + -1.333333334 = 3.743848737 a = 3.743848737 Simplifying a = 3.743848737Subproblem 2
a + 1.333333334 = -5.077182071 Simplifying a + 1.333333334 = -5.077182071 Reorder the terms: 1.333333334 + a = -5.077182071 Solving 1.333333334 + a = -5.077182071 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + a = -5.077182071 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + a = -5.077182071 + -1.333333334 a = -5.077182071 + -1.333333334 Combine like terms: -5.077182071 + -1.333333334 = -6.410515405 a = -6.410515405 Simplifying a = -6.410515405Solution
The solution to the problem is based on the solutions from the subproblems. a = {3.743848737, -6.410515405}
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