3a^2-12a=5

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Solution for 3a^2-12a=5 equation:


Simplifying
3a2 + -12a = 5

Reorder the terms:
-12a + 3a2 = 5

Solving
-12a + 3a2 = 5

Solving for variable 'a'.

Reorder the terms:
-5 + -12a + 3a2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -12a + 3a2 = 0

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

Divide each side by '3'.
-1.666666667 + -4a + a2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + -4a + 1.666666667 + a2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + -4a + a2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -4a + a2 = 0 + 1.666666667
-4a + a2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
-4a + a2 = 1.666666667

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 = 1.666666667 + 4

Reorder the terms:
4 + -4a + a2 = 1.666666667 + 4

Combine like terms: 1.666666667 + 4 = 5.666666667
4 + -4a + a2 = 5.666666667

Factor a perfect square on the left side:
(a + -2)(a + -2) = 5.666666667

Calculate the square root of the right side: 2.380476143

Break this problem into two subproblems by setting 
(a + -2) equal to 2.380476143 and -2.380476143.

Subproblem 1

a + -2 = 2.380476143 Simplifying a + -2 = 2.380476143 Reorder the terms: -2 + a = 2.380476143 Solving -2 + a = 2.380476143 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 = 2.380476143 + 2 Combine like terms: -2 + 2 = 0 0 + a = 2.380476143 + 2 a = 2.380476143 + 2 Combine like terms: 2.380476143 + 2 = 4.380476143 a = 4.380476143 Simplifying a = 4.380476143

Subproblem 2

a + -2 = -2.380476143 Simplifying a + -2 = -2.380476143 Reorder the terms: -2 + a = -2.380476143 Solving -2 + a = -2.380476143 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 = -2.380476143 + 2 Combine like terms: -2 + 2 = 0 0 + a = -2.380476143 + 2 a = -2.380476143 + 2 Combine like terms: -2.380476143 + 2 = -0.380476143 a = -0.380476143 Simplifying a = -0.380476143

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.380476143, -0.380476143}

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