a^2-17a=12

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Solution for a^2-17a=12 equation:


Simplifying
a2 + -17a = 12

Reorder the terms:
-17a + a2 = 12

Solving
-17a + a2 = 12

Solving for variable 'a'.

Reorder the terms:
-12 + -17a + a2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -17a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -17a + 12 + a2 = 0 + 12

Reorder the terms:
-12 + 12 + -17a + a2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -17a + a2 = 0 + 12
-17a + a2 = 0 + 12

Combine like terms: 0 + 12 = 12
-17a + a2 = 12

The a term is -17a.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17a + 72.25 + a2 = 12 + 72.25

Reorder the terms:
72.25 + -17a + a2 = 12 + 72.25

Combine like terms: 12 + 72.25 = 84.25
72.25 + -17a + a2 = 84.25

Factor a perfect square on the left side:
(a + -8.5)(a + -8.5) = 84.25

Calculate the square root of the right side: 9.178779875

Break this problem into two subproblems by setting 
(a + -8.5) equal to 9.178779875 and -9.178779875.

Subproblem 1

a + -8.5 = 9.178779875 Simplifying a + -8.5 = 9.178779875 Reorder the terms: -8.5 + a = 9.178779875 Solving -8.5 + a = 9.178779875 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + a = 9.178779875 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + a = 9.178779875 + 8.5 a = 9.178779875 + 8.5 Combine like terms: 9.178779875 + 8.5 = 17.678779875 a = 17.678779875 Simplifying a = 17.678779875

Subproblem 2

a + -8.5 = -9.178779875 Simplifying a + -8.5 = -9.178779875 Reorder the terms: -8.5 + a = -9.178779875 Solving -8.5 + a = -9.178779875 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + a = -9.178779875 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + a = -9.178779875 + 8.5 a = -9.178779875 + 8.5 Combine like terms: -9.178779875 + 8.5 = -0.678779875 a = -0.678779875 Simplifying a = -0.678779875

Solution

The solution to the problem is based on the solutions from the subproblems. a = {17.678779875, -0.678779875}

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