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

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


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

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

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

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

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

Combine like terms: -4 + -6 = -10
-10 + 3a + 9a2 + 6a2 = 0

Combine like terms: 9a2 + 6a2 = 15a2
-10 + 3a + 15a2 = 0

Solving
-10 + 3a + 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'.
-0.6666666667 + 0.2a + a2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + 0.2a + 0.6666666667 + a2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + 0.2a + a2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + 0.2a + a2 = 0 + 0.6666666667
0.2a + a2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
0.2a + a2 = 0.6666666667

The a term is 0.2a.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2a + 0.01 + a2 = 0.6666666667 + 0.01

Reorder the terms:
0.01 + 0.2a + a2 = 0.6666666667 + 0.01

Combine like terms: 0.6666666667 + 0.01 = 0.6766666667
0.01 + 0.2a + a2 = 0.6766666667

Factor a perfect square on the left side:
(a + 0.1)(a + 0.1) = 0.6766666667

Calculate the square root of the right side: 0.822597512

Break this problem into two subproblems by setting 
(a + 0.1) equal to 0.822597512 and -0.822597512.

Subproblem 1

a + 0.1 = 0.822597512 Simplifying a + 0.1 = 0.822597512 Reorder the terms: 0.1 + a = 0.822597512 Solving 0.1 + a = 0.822597512 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + a = 0.822597512 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + a = 0.822597512 + -0.1 a = 0.822597512 + -0.1 Combine like terms: 0.822597512 + -0.1 = 0.722597512 a = 0.722597512 Simplifying a = 0.722597512

Subproblem 2

a + 0.1 = -0.822597512 Simplifying a + 0.1 = -0.822597512 Reorder the terms: 0.1 + a = -0.822597512 Solving 0.1 + a = -0.822597512 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + a = -0.822597512 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + a = -0.822597512 + -0.1 a = -0.822597512 + -0.1 Combine like terms: -0.822597512 + -0.1 = -0.922597512 a = -0.922597512 Simplifying a = -0.922597512

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.722597512, -0.922597512}

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