(9a^2-4-5a)-(12a-6a^2+3)=

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Solution for (9a^2-4-5a)-(12a-6a^2+3)= equation:


Simplifying
(9a2 + -4 + -5a) + -1(12a + -6a2 + 3) = 0

Reorder the terms:
(-4 + -5a + 9a2) + -1(12a + -6a2 + 3) = 0

Remove parenthesis around (-4 + -5a + 9a2)
-4 + -5a + 9a2 + -1(12a + -6a2 + 3) = 0

Reorder the terms:
-4 + -5a + 9a2 + -1(3 + 12a + -6a2) = 0
-4 + -5a + 9a2 + (3 * -1 + 12a * -1 + -6a2 * -1) = 0
-4 + -5a + 9a2 + (-3 + -12a + 6a2) = 0

Reorder the terms:
-4 + -3 + -5a + -12a + 9a2 + 6a2 = 0

Combine like terms: -4 + -3 = -7
-7 + -5a + -12a + 9a2 + 6a2 = 0

Combine like terms: -5a + -12a = -17a
-7 + -17a + 9a2 + 6a2 = 0

Combine like terms: 9a2 + 6a2 = 15a2
-7 + -17a + 15a2 = 0

Solving
-7 + -17a + 15a2 = 0

Solving for variable 'a'.

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

Divide each side by '15'.
-0.4666666667 + -1.133333333a + a2 = 0

Move the constant term to the right:

Add '0.4666666667' to each side of the equation.
-0.4666666667 + -1.133333333a + 0.4666666667 + a2 = 0 + 0.4666666667

Reorder the terms:
-0.4666666667 + 0.4666666667 + -1.133333333a + a2 = 0 + 0.4666666667

Combine like terms: -0.4666666667 + 0.4666666667 = 0.0000000000
0.0000000000 + -1.133333333a + a2 = 0 + 0.4666666667
-1.133333333a + a2 = 0 + 0.4666666667

Combine like terms: 0 + 0.4666666667 = 0.4666666667
-1.133333333a + a2 = 0.4666666667

The a term is -1.133333333a.  Take half its coefficient (-0.5666666665).
Square it (0.3211111109) and add it to both sides.

Add '0.3211111109' to each side of the equation.
-1.133333333a + 0.3211111109 + a2 = 0.4666666667 + 0.3211111109

Reorder the terms:
0.3211111109 + -1.133333333a + a2 = 0.4666666667 + 0.3211111109

Combine like terms: 0.4666666667 + 0.3211111109 = 0.7877777776
0.3211111109 + -1.133333333a + a2 = 0.7877777776

Factor a perfect square on the left side:
(a + -0.5666666665)(a + -0.5666666665) = 0.7877777776

Calculate the square root of the right side: 0.887568464

Break this problem into two subproblems by setting 
(a + -0.5666666665) equal to 0.887568464 and -0.887568464.

Subproblem 1

a + -0.5666666665 = 0.887568464 Simplifying a + -0.5666666665 = 0.887568464 Reorder the terms: -0.5666666665 + a = 0.887568464 Solving -0.5666666665 + a = 0.887568464 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.5666666665' to each side of the equation. -0.5666666665 + 0.5666666665 + a = 0.887568464 + 0.5666666665 Combine like terms: -0.5666666665 + 0.5666666665 = 0.0000000000 0.0000000000 + a = 0.887568464 + 0.5666666665 a = 0.887568464 + 0.5666666665 Combine like terms: 0.887568464 + 0.5666666665 = 1.4542351305 a = 1.4542351305 Simplifying a = 1.4542351305

Subproblem 2

a + -0.5666666665 = -0.887568464 Simplifying a + -0.5666666665 = -0.887568464 Reorder the terms: -0.5666666665 + a = -0.887568464 Solving -0.5666666665 + a = -0.887568464 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.5666666665' to each side of the equation. -0.5666666665 + 0.5666666665 + a = -0.887568464 + 0.5666666665 Combine like terms: -0.5666666665 + 0.5666666665 = 0.0000000000 0.0000000000 + a = -0.887568464 + 0.5666666665 a = -0.887568464 + 0.5666666665 Combine like terms: -0.887568464 + 0.5666666665 = -0.3209017975 a = -0.3209017975 Simplifying a = -0.3209017975

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.4542351305, -0.3209017975}

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