a^2-6a-12=-6

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Solution for a^2-6a-12=-6 equation:


Simplifying
a2 + -6a + -12 = -6

Reorder the terms:
-12 + -6a + a2 = -6

Solving
-12 + -6a + a2 = -6

Solving for variable 'a'.

Reorder the terms:
-12 + 6 + -6a + a2 = -6 + 6

Combine like terms: -12 + 6 = -6
-6 + -6a + a2 = -6 + 6

Combine like terms: -6 + 6 = 0
-6 + -6a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -6a + 6 + a2 = 0 + 6

Reorder the terms:
-6 + 6 + -6a + a2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -6a + a2 = 0 + 6
-6a + a2 = 0 + 6

Combine like terms: 0 + 6 = 6
-6a + a2 = 6

The a term is -6a.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6a + 9 + a2 = 6 + 9

Reorder the terms:
9 + -6a + a2 = 6 + 9

Combine like terms: 6 + 9 = 15
9 + -6a + a2 = 15

Factor a perfect square on the left side:
(a + -3)(a + -3) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(a + -3) equal to 3.872983346 and -3.872983346.

Subproblem 1

a + -3 = 3.872983346 Simplifying a + -3 = 3.872983346 Reorder the terms: -3 + a = 3.872983346 Solving -3 + a = 3.872983346 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + a = 3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + a = 3.872983346 + 3 a = 3.872983346 + 3 Combine like terms: 3.872983346 + 3 = 6.872983346 a = 6.872983346 Simplifying a = 6.872983346

Subproblem 2

a + -3 = -3.872983346 Simplifying a + -3 = -3.872983346 Reorder the terms: -3 + a = -3.872983346 Solving -3 + a = -3.872983346 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + a = -3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + a = -3.872983346 + 3 a = -3.872983346 + 3 Combine like terms: -3.872983346 + 3 = -0.872983346 a = -0.872983346 Simplifying a = -0.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. a = {6.872983346, -0.872983346}

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