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Simplifying 2a2 + 13a = 20 Reorder the terms: 13a + 2a2 = 20 Solving 13a + 2a2 = 20 Solving for variable 'a'. Reorder the terms: -20 + 13a + 2a2 = 20 + -20 Combine like terms: 20 + -20 = 0 -20 + 13a + 2a2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -10 + 6.5a + a2 = 0 Move the constant term to the right: Add '10' to each side of the equation. -10 + 6.5a + 10 + a2 = 0 + 10 Reorder the terms: -10 + 10 + 6.5a + a2 = 0 + 10 Combine like terms: -10 + 10 = 0 0 + 6.5a + a2 = 0 + 10 6.5a + a2 = 0 + 10 Combine like terms: 0 + 10 = 10 6.5a + a2 = 10 The a term is 6.5a. Take half its coefficient (3.25). Square it (10.5625) and add it to both sides. Add '10.5625' to each side of the equation. 6.5a + 10.5625 + a2 = 10 + 10.5625 Reorder the terms: 10.5625 + 6.5a + a2 = 10 + 10.5625 Combine like terms: 10 + 10.5625 = 20.5625 10.5625 + 6.5a + a2 = 20.5625 Factor a perfect square on the left side: (a + 3.25)(a + 3.25) = 20.5625 Calculate the square root of the right side: 4.534589287 Break this problem into two subproblems by setting (a + 3.25) equal to 4.534589287 and -4.534589287.Subproblem 1
a + 3.25 = 4.534589287 Simplifying a + 3.25 = 4.534589287 Reorder the terms: 3.25 + a = 4.534589287 Solving 3.25 + a = 4.534589287 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + a = 4.534589287 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + a = 4.534589287 + -3.25 a = 4.534589287 + -3.25 Combine like terms: 4.534589287 + -3.25 = 1.284589287 a = 1.284589287 Simplifying a = 1.284589287Subproblem 2
a + 3.25 = -4.534589287 Simplifying a + 3.25 = -4.534589287 Reorder the terms: 3.25 + a = -4.534589287 Solving 3.25 + a = -4.534589287 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + a = -4.534589287 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + a = -4.534589287 + -3.25 a = -4.534589287 + -3.25 Combine like terms: -4.534589287 + -3.25 = -7.784589287 a = -7.784589287 Simplifying a = -7.784589287Solution
The solution to the problem is based on the solutions from the subproblems. a = {1.284589287, -7.784589287}
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