a^2-17a+12=0

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Solution for a^2-17a+12=0 equation:


Simplifying
a2 + -17a + 12 = 0

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

Solving
12 + -17a + a2 = 0

Solving for variable 'a'.

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 = 60.25
72.25 + -17a + a2 = 60.25

Factor a perfect square on the left side:
(a + -8.5)(a + -8.5) = 60.25

Calculate the square root of the right side: 7.762087348

Break this problem into two subproblems by setting 
(a + -8.5) equal to 7.762087348 and -7.762087348.

Subproblem 1

a + -8.5 = 7.762087348 Simplifying a + -8.5 = 7.762087348 Reorder the terms: -8.5 + a = 7.762087348 Solving -8.5 + a = 7.762087348 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 = 7.762087348 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + a = 7.762087348 + 8.5 a = 7.762087348 + 8.5 Combine like terms: 7.762087348 + 8.5 = 16.262087348 a = 16.262087348 Simplifying a = 16.262087348

Subproblem 2

a + -8.5 = -7.762087348 Simplifying a + -8.5 = -7.762087348 Reorder the terms: -8.5 + a = -7.762087348 Solving -8.5 + a = -7.762087348 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 = -7.762087348 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + a = -7.762087348 + 8.5 a = -7.762087348 + 8.5 Combine like terms: -7.762087348 + 8.5 = 0.737912652 a = 0.737912652 Simplifying a = 0.737912652

Solution

The solution to the problem is based on the solutions from the subproblems. a = {16.262087348, 0.737912652}

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