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Simplifying a2 + -10a + -20 = 5 Reorder the terms: -20 + -10a + a2 = 5 Solving -20 + -10a + a2 = 5 Solving for variable 'a'. Reorder the terms: -20 + -5 + -10a + a2 = 5 + -5 Combine like terms: -20 + -5 = -25 -25 + -10a + a2 = 5 + -5 Combine like terms: 5 + -5 = 0 -25 + -10a + a2 = 0 Begin completing the square. Move the constant term to the right: Add '25' to each side of the equation. -25 + -10a + 25 + a2 = 0 + 25 Reorder the terms: -25 + 25 + -10a + a2 = 0 + 25 Combine like terms: -25 + 25 = 0 0 + -10a + a2 = 0 + 25 -10a + a2 = 0 + 25 Combine like terms: 0 + 25 = 25 -10a + a2 = 25 The a term is -10a. Take half its coefficient (-5). Square it (25) and add it to both sides. Add '25' to each side of the equation. -10a + 25 + a2 = 25 + 25 Reorder the terms: 25 + -10a + a2 = 25 + 25 Combine like terms: 25 + 25 = 50 25 + -10a + a2 = 50 Factor a perfect square on the left side: (a + -5)(a + -5) = 50 Calculate the square root of the right side: 7.071067812 Break this problem into two subproblems by setting (a + -5) equal to 7.071067812 and -7.071067812.Subproblem 1
a + -5 = 7.071067812 Simplifying a + -5 = 7.071067812 Reorder the terms: -5 + a = 7.071067812 Solving -5 + a = 7.071067812 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + a = 7.071067812 + 5 Combine like terms: -5 + 5 = 0 0 + a = 7.071067812 + 5 a = 7.071067812 + 5 Combine like terms: 7.071067812 + 5 = 12.071067812 a = 12.071067812 Simplifying a = 12.071067812Subproblem 2
a + -5 = -7.071067812 Simplifying a + -5 = -7.071067812 Reorder the terms: -5 + a = -7.071067812 Solving -5 + a = -7.071067812 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + a = -7.071067812 + 5 Combine like terms: -5 + 5 = 0 0 + a = -7.071067812 + 5 a = -7.071067812 + 5 Combine like terms: -7.071067812 + 5 = -2.071067812 a = -2.071067812 Simplifying a = -2.071067812Solution
The solution to the problem is based on the solutions from the subproblems. a = {12.071067812, -2.071067812}
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