(5a-3a^2)+(8+7a)=

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Solution for (5a-3a^2)+(8+7a)= equation:


Simplifying
(5a + -3a2) + (8 + 7a) = 0

Remove parenthesis around (5a + -3a2)
5a + -3a2 + (8 + 7a) = 0

Remove parenthesis around (8 + 7a)
5a + -3a2 + 8 + 7a = 0

Reorder the terms:
8 + 5a + 7a + -3a2 = 0

Combine like terms: 5a + 7a = 12a
8 + 12a + -3a2 = 0

Solving
8 + 12a + -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'.
-2.666666667 + -4a + a2 = 0

Move the constant term to the right:

Add '2.666666667' to each side of the equation.
-2.666666667 + -4a + 2.666666667 + a2 = 0 + 2.666666667

Reorder the terms:
-2.666666667 + 2.666666667 + -4a + a2 = 0 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + -4a + a2 = 0 + 2.666666667
-4a + a2 = 0 + 2.666666667

Combine like terms: 0 + 2.666666667 = 2.666666667
-4a + a2 = 2.666666667

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 = 2.666666667 + 4

Reorder the terms:
4 + -4a + a2 = 2.666666667 + 4

Combine like terms: 2.666666667 + 4 = 6.666666667
4 + -4a + a2 = 6.666666667

Factor a perfect square on the left side:
(a + -2)(a + -2) = 6.666666667

Calculate the square root of the right side: 2.581988898

Break this problem into two subproblems by setting 
(a + -2) equal to 2.581988898 and -2.581988898.

Subproblem 1

a + -2 = 2.581988898 Simplifying a + -2 = 2.581988898 Reorder the terms: -2 + a = 2.581988898 Solving -2 + a = 2.581988898 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 = 2.581988898 + 2 Combine like terms: -2 + 2 = 0 0 + a = 2.581988898 + 2 a = 2.581988898 + 2 Combine like terms: 2.581988898 + 2 = 4.581988898 a = 4.581988898 Simplifying a = 4.581988898

Subproblem 2

a + -2 = -2.581988898 Simplifying a + -2 = -2.581988898 Reorder the terms: -2 + a = -2.581988898 Solving -2 + a = -2.581988898 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 = -2.581988898 + 2 Combine like terms: -2 + 2 = 0 0 + a = -2.581988898 + 2 a = -2.581988898 + 2 Combine like terms: -2.581988898 + 2 = -0.581988898 a = -0.581988898 Simplifying a = -0.581988898

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.581988898, -0.581988898}

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