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Simplifying -5a2 + 18a + -6 + 7a2 + -21a + 5 = 0 Reorder the terms: -6 + 5 + 18a + -21a + -5a2 + 7a2 = 0 Combine like terms: -6 + 5 = -1 -1 + 18a + -21a + -5a2 + 7a2 = 0 Combine like terms: 18a + -21a = -3a -1 + -3a + -5a2 + 7a2 = 0 Combine like terms: -5a2 + 7a2 = 2a2 -1 + -3a + 2a2 = 0 Solving -1 + -3a + 2a2 = 0 Solving for variable 'a'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -0.5 + -1.5a + a2 = 0 Move the constant term to the right: Add '0.5' to each side of the equation. -0.5 + -1.5a + 0.5 + a2 = 0 + 0.5 Reorder the terms: -0.5 + 0.5 + -1.5a + a2 = 0 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + -1.5a + a2 = 0 + 0.5 -1.5a + a2 = 0 + 0.5 Combine like terms: 0 + 0.5 = 0.5 -1.5a + a2 = 0.5 The a term is -1.5a. Take half its coefficient (-0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. -1.5a + 0.5625 + a2 = 0.5 + 0.5625 Reorder the terms: 0.5625 + -1.5a + a2 = 0.5 + 0.5625 Combine like terms: 0.5 + 0.5625 = 1.0625 0.5625 + -1.5a + a2 = 1.0625 Factor a perfect square on the left side: (a + -0.75)(a + -0.75) = 1.0625 Calculate the square root of the right side: 1.030776406 Break this problem into two subproblems by setting (a + -0.75) equal to 1.030776406 and -1.030776406.Subproblem 1
a + -0.75 = 1.030776406 Simplifying a + -0.75 = 1.030776406 Reorder the terms: -0.75 + a = 1.030776406 Solving -0.75 + a = 1.030776406 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + a = 1.030776406 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + a = 1.030776406 + 0.75 a = 1.030776406 + 0.75 Combine like terms: 1.030776406 + 0.75 = 1.780776406 a = 1.780776406 Simplifying a = 1.780776406Subproblem 2
a + -0.75 = -1.030776406 Simplifying a + -0.75 = -1.030776406 Reorder the terms: -0.75 + a = -1.030776406 Solving -0.75 + a = -1.030776406 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + a = -1.030776406 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + a = -1.030776406 + 0.75 a = -1.030776406 + 0.75 Combine like terms: -1.030776406 + 0.75 = -0.280776406 a = -0.280776406 Simplifying a = -0.280776406Solution
The solution to the problem is based on the solutions from the subproblems. a = {1.780776406, -0.280776406}
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