(6a-4a^2)+(8+9a)=

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Solution for (6a-4a^2)+(8+9a)= equation:


Simplifying
(6a + -4a2) + (8 + 9a) = 0

Remove parenthesis around (6a + -4a2)
6a + -4a2 + (8 + 9a) = 0

Remove parenthesis around (8 + 9a)
6a + -4a2 + 8 + 9a = 0

Reorder the terms:
8 + 6a + 9a + -4a2 = 0

Combine like terms: 6a + 9a = 15a
8 + 15a + -4a2 = 0

Solving
8 + 15a + -4a2 = 0

Solving for variable 'a'.

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-2 + -3.75a + a2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -3.75a + 2 + a2 = 0 + 2

Reorder the terms:
-2 + 2 + -3.75a + a2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -3.75a + a2 = 0 + 2
-3.75a + a2 = 0 + 2

Combine like terms: 0 + 2 = 2
-3.75a + a2 = 2

The a term is -3.75a.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75a + 3.515625 + a2 = 2 + 3.515625

Reorder the terms:
3.515625 + -3.75a + a2 = 2 + 3.515625

Combine like terms: 2 + 3.515625 = 5.515625
3.515625 + -3.75a + a2 = 5.515625

Factor a perfect square on the left side:
(a + -1.875)(a + -1.875) = 5.515625

Calculate the square root of the right side: 2.348536779

Break this problem into two subproblems by setting 
(a + -1.875) equal to 2.348536779 and -2.348536779.

Subproblem 1

a + -1.875 = 2.348536779 Simplifying a + -1.875 = 2.348536779 Reorder the terms: -1.875 + a = 2.348536779 Solving -1.875 + a = 2.348536779 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + a = 2.348536779 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + a = 2.348536779 + 1.875 a = 2.348536779 + 1.875 Combine like terms: 2.348536779 + 1.875 = 4.223536779 a = 4.223536779 Simplifying a = 4.223536779

Subproblem 2

a + -1.875 = -2.348536779 Simplifying a + -1.875 = -2.348536779 Reorder the terms: -1.875 + a = -2.348536779 Solving -1.875 + a = -2.348536779 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + a = -2.348536779 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + a = -2.348536779 + 1.875 a = -2.348536779 + 1.875 Combine like terms: -2.348536779 + 1.875 = -0.473536779 a = -0.473536779 Simplifying a = -0.473536779

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.223536779, -0.473536779}

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