2a^2-a-12=2

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


Simplifying
2a2 + -1a + -12 = 2

Reorder the terms:
-12 + -1a + 2a2 = 2

Solving
-12 + -1a + 2a2 = 2

Solving for variable 'a'.

Reorder the terms:
-12 + -2 + -1a + 2a2 = 2 + -2

Combine like terms: -12 + -2 = -14
-14 + -1a + 2a2 = 2 + -2

Combine like terms: 2 + -2 = 0
-14 + -1a + 2a2 = 0

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

Divide each side by '2'.
-7 + -0.5a + a2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -0.5a + 7 + a2 = 0 + 7

Reorder the terms:
-7 + 7 + -0.5a + a2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -0.5a + a2 = 0 + 7
-0.5a + a2 = 0 + 7

Combine like terms: 0 + 7 = 7
-0.5a + a2 = 7

The a term is -0.5a.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5a + 0.0625 + a2 = 7 + 0.0625

Reorder the terms:
0.0625 + -0.5a + a2 = 7 + 0.0625

Combine like terms: 7 + 0.0625 = 7.0625
0.0625 + -0.5a + a2 = 7.0625

Factor a perfect square on the left side:
(a + -0.25)(a + -0.25) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(a + -0.25) equal to 2.657536453 and -2.657536453.

Subproblem 1

a + -0.25 = 2.657536453 Simplifying a + -0.25 = 2.657536453 Reorder the terms: -0.25 + a = 2.657536453 Solving -0.25 + a = 2.657536453 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + a = 2.657536453 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + a = 2.657536453 + 0.25 a = 2.657536453 + 0.25 Combine like terms: 2.657536453 + 0.25 = 2.907536453 a = 2.907536453 Simplifying a = 2.907536453

Subproblem 2

a + -0.25 = -2.657536453 Simplifying a + -0.25 = -2.657536453 Reorder the terms: -0.25 + a = -2.657536453 Solving -0.25 + a = -2.657536453 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + a = -2.657536453 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + a = -2.657536453 + 0.25 a = -2.657536453 + 0.25 Combine like terms: -2.657536453 + 0.25 = -2.407536453 a = -2.407536453 Simplifying a = -2.407536453

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.907536453, -2.407536453}

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