8a^2-16a-12=-5

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Solution for 8a^2-16a-12=-5 equation:


Simplifying
8a2 + -16a + -12 = -5

Reorder the terms:
-12 + -16a + 8a2 = -5

Solving
-12 + -16a + 8a2 = -5

Solving for variable 'a'.

Reorder the terms:
-12 + 5 + -16a + 8a2 = -5 + 5

Combine like terms: -12 + 5 = -7
-7 + -16a + 8a2 = -5 + 5

Combine like terms: -5 + 5 = 0
-7 + -16a + 8a2 = 0

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-0.875 + -2a + a2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -2a + 0.875 + a2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -2a + a2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -2a + a2 = 0 + 0.875
-2a + a2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-2a + a2 = 0.875

The a term is -2a.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2a + 1 + a2 = 0.875 + 1

Reorder the terms:
1 + -2a + a2 = 0.875 + 1

Combine like terms: 0.875 + 1 = 1.875
1 + -2a + a2 = 1.875

Factor a perfect square on the left side:
(a + -1)(a + -1) = 1.875

Calculate the square root of the right side: 1.369306394

Break this problem into two subproblems by setting 
(a + -1) equal to 1.369306394 and -1.369306394.

Subproblem 1

a + -1 = 1.369306394 Simplifying a + -1 = 1.369306394 Reorder the terms: -1 + a = 1.369306394 Solving -1 + a = 1.369306394 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + a = 1.369306394 + 1 Combine like terms: -1 + 1 = 0 0 + a = 1.369306394 + 1 a = 1.369306394 + 1 Combine like terms: 1.369306394 + 1 = 2.369306394 a = 2.369306394 Simplifying a = 2.369306394

Subproblem 2

a + -1 = -1.369306394 Simplifying a + -1 = -1.369306394 Reorder the terms: -1 + a = -1.369306394 Solving -1 + a = -1.369306394 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + a = -1.369306394 + 1 Combine like terms: -1 + 1 = 0 0 + a = -1.369306394 + 1 a = -1.369306394 + 1 Combine like terms: -1.369306394 + 1 = -0.369306394 a = -0.369306394 Simplifying a = -0.369306394

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.369306394, -0.369306394}

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