a^2+4a-2012=0

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Solution for a^2+4a-2012=0 equation:


Simplifying
a2 + 4a + -2012 = 0

Reorder the terms:
-2012 + 4a + a2 = 0

Solving
-2012 + 4a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '2012' to each side of the equation.
-2012 + 4a + 2012 + a2 = 0 + 2012

Reorder the terms:
-2012 + 2012 + 4a + a2 = 0 + 2012

Combine like terms: -2012 + 2012 = 0
0 + 4a + a2 = 0 + 2012
4a + a2 = 0 + 2012

Combine like terms: 0 + 2012 = 2012
4a + a2 = 2012

The a term is 4a.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4a + 4 + a2 = 2012 + 4

Reorder the terms:
4 + 4a + a2 = 2012 + 4

Combine like terms: 2012 + 4 = 2016
4 + 4a + a2 = 2016

Factor a perfect square on the left side:
(a + 2)(a + 2) = 2016

Calculate the square root of the right side: 44.899888641

Break this problem into two subproblems by setting 
(a + 2) equal to 44.899888641 and -44.899888641.

Subproblem 1

a + 2 = 44.899888641 Simplifying a + 2 = 44.899888641 Reorder the terms: 2 + a = 44.899888641 Solving 2 + a = 44.899888641 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = 44.899888641 + -2 Combine like terms: 2 + -2 = 0 0 + a = 44.899888641 + -2 a = 44.899888641 + -2 Combine like terms: 44.899888641 + -2 = 42.899888641 a = 42.899888641 Simplifying a = 42.899888641

Subproblem 2

a + 2 = -44.899888641 Simplifying a + 2 = -44.899888641 Reorder the terms: 2 + a = -44.899888641 Solving 2 + a = -44.899888641 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = -44.899888641 + -2 Combine like terms: 2 + -2 = 0 0 + a = -44.899888641 + -2 a = -44.899888641 + -2 Combine like terms: -44.899888641 + -2 = -46.899888641 a = -46.899888641 Simplifying a = -46.899888641

Solution

The solution to the problem is based on the solutions from the subproblems. a = {42.899888641, -46.899888641}

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