6a^2+3a-9a^2+2a+7+6=

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Solution for 6a^2+3a-9a^2+2a+7+6= equation:


Simplifying
6a2 + 3a + -9a2 + 2a + 7 + 6 = 0

Reorder the terms:
7 + 6 + 3a + 2a + 6a2 + -9a2 = 0

Combine like terms: 7 + 6 = 13
13 + 3a + 2a + 6a2 + -9a2 = 0

Combine like terms: 3a + 2a = 5a
13 + 5a + 6a2 + -9a2 = 0

Combine like terms: 6a2 + -9a2 = -3a2
13 + 5a + -3a2 = 0

Solving
13 + 5a + -3a2 = 0

Solving for variable 'a'.

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

Divide each side by '-3'.
-4.333333333 + -1.666666667a + a2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + -1.666666667a + 4.333333333 + a2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + -1.666666667a + a2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + -1.666666667a + a2 = 0 + 4.333333333
-1.666666667a + a2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
-1.666666667a + a2 = 4.333333333

The a term is -1.666666667a.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667a + 0.6944444447 + a2 = 4.333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667a + a2 = 4.333333333 + 0.6944444447

Combine like terms: 4.333333333 + 0.6944444447 = 5.0277777777
0.6944444447 + -1.666666667a + a2 = 5.0277777777

Factor a perfect square on the left side:
(a + -0.8333333335)(a + -0.8333333335) = 5.0277777777

Calculate the square root of the right side: 2.242270674

Break this problem into two subproblems by setting 
(a + -0.8333333335) equal to 2.242270674 and -2.242270674.

Subproblem 1

a + -0.8333333335 = 2.242270674 Simplifying a + -0.8333333335 = 2.242270674 Reorder the terms: -0.8333333335 + a = 2.242270674 Solving -0.8333333335 + a = 2.242270674 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + a = 2.242270674 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + a = 2.242270674 + 0.8333333335 a = 2.242270674 + 0.8333333335 Combine like terms: 2.242270674 + 0.8333333335 = 3.0756040075 a = 3.0756040075 Simplifying a = 3.0756040075

Subproblem 2

a + -0.8333333335 = -2.242270674 Simplifying a + -0.8333333335 = -2.242270674 Reorder the terms: -0.8333333335 + a = -2.242270674 Solving -0.8333333335 + a = -2.242270674 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + a = -2.242270674 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + a = -2.242270674 + 0.8333333335 a = -2.242270674 + 0.8333333335 Combine like terms: -2.242270674 + 0.8333333335 = -1.4089373405 a = -1.4089373405 Simplifying a = -1.4089373405

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.0756040075, -1.4089373405}

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