a^2+12a-11=0

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Solution for a^2+12a-11=0 equation:


Simplifying
a2 + 12a + -11 = 0

Reorder the terms:
-11 + 12a + a2 = 0

Solving
-11 + 12a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 12a + 11 + a2 = 0 + 11

Reorder the terms:
-11 + 11 + 12a + a2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 12a + a2 = 0 + 11
12a + a2 = 0 + 11

Combine like terms: 0 + 11 = 11
12a + a2 = 11

The a term is 12a.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12a + 36 + a2 = 11 + 36

Reorder the terms:
36 + 12a + a2 = 11 + 36

Combine like terms: 11 + 36 = 47
36 + 12a + a2 = 47

Factor a perfect square on the left side:
(a + 6)(a + 6) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(a + 6) equal to 6.8556546 and -6.8556546.

Subproblem 1

a + 6 = 6.8556546 Simplifying a + 6 = 6.8556546 Reorder the terms: 6 + a = 6.8556546 Solving 6 + a = 6.8556546 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + a = 6.8556546 + -6 Combine like terms: 6 + -6 = 0 0 + a = 6.8556546 + -6 a = 6.8556546 + -6 Combine like terms: 6.8556546 + -6 = 0.8556546 a = 0.8556546 Simplifying a = 0.8556546

Subproblem 2

a + 6 = -6.8556546 Simplifying a + 6 = -6.8556546 Reorder the terms: 6 + a = -6.8556546 Solving 6 + a = -6.8556546 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + a = -6.8556546 + -6 Combine like terms: 6 + -6 = 0 0 + a = -6.8556546 + -6 a = -6.8556546 + -6 Combine like terms: -6.8556546 + -6 = -12.8556546 a = -12.8556546 Simplifying a = -12.8556546

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.8556546, -12.8556546}

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