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Simplifying 2a2 + -9a + 5 = 0 Reorder the terms: 5 + -9a + 2a2 = 0 Solving 5 + -9a + 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'. 2.5 + -4.5a + a2 = 0 Move the constant term to the right: Add '-2.5' to each side of the equation. 2.5 + -4.5a + -2.5 + a2 = 0 + -2.5 Reorder the terms: 2.5 + -2.5 + -4.5a + a2 = 0 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + -4.5a + a2 = 0 + -2.5 -4.5a + a2 = 0 + -2.5 Combine like terms: 0 + -2.5 = -2.5 -4.5a + a2 = -2.5 The a term is -4.5a. Take half its coefficient (-2.25). Square it (5.0625) and add it to both sides. Add '5.0625' to each side of the equation. -4.5a + 5.0625 + a2 = -2.5 + 5.0625 Reorder the terms: 5.0625 + -4.5a + a2 = -2.5 + 5.0625 Combine like terms: -2.5 + 5.0625 = 2.5625 5.0625 + -4.5a + a2 = 2.5625 Factor a perfect square on the left side: (a + -2.25)(a + -2.25) = 2.5625 Calculate the square root of the right side: 1.600781059 Break this problem into two subproblems by setting (a + -2.25) equal to 1.600781059 and -1.600781059.Subproblem 1
a + -2.25 = 1.600781059 Simplifying a + -2.25 = 1.600781059 Reorder the terms: -2.25 + a = 1.600781059 Solving -2.25 + a = 1.600781059 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + a = 1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + a = 1.600781059 + 2.25 a = 1.600781059 + 2.25 Combine like terms: 1.600781059 + 2.25 = 3.850781059 a = 3.850781059 Simplifying a = 3.850781059Subproblem 2
a + -2.25 = -1.600781059 Simplifying a + -2.25 = -1.600781059 Reorder the terms: -2.25 + a = -1.600781059 Solving -2.25 + a = -1.600781059 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + a = -1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + a = -1.600781059 + 2.25 a = -1.600781059 + 2.25 Combine like terms: -1.600781059 + 2.25 = 0.649218941 a = 0.649218941 Simplifying a = 0.649218941Solution
The solution to the problem is based on the solutions from the subproblems. a = {3.850781059, 0.649218941}
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