5a(8+2a)+5=(-1a+1)-5+12

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Solution for 5a(8+2a)+5=(-1a+1)-5+12 equation:


Simplifying
5a(8 + 2a) + 5 = (-1a + 1) + -5 + 12
(8 * 5a + 2a * 5a) + 5 = (-1a + 1) + -5 + 12
(40a + 10a2) + 5 = (-1a + 1) + -5 + 12

Reorder the terms:
5 + 40a + 10a2 = (-1a + 1) + -5 + 12

Reorder the terms:
5 + 40a + 10a2 = (1 + -1a) + -5 + 12

Remove parenthesis around (1 + -1a)
5 + 40a + 10a2 = 1 + -1a + -5 + 12

Reorder the terms:
5 + 40a + 10a2 = 1 + -5 + 12 + -1a

Combine like terms: 1 + -5 = -4
5 + 40a + 10a2 = -4 + 12 + -1a

Combine like terms: -4 + 12 = 8
5 + 40a + 10a2 = 8 + -1a

Solving
5 + 40a + 10a2 = 8 + -1a

Solving for variable 'a'.

Reorder the terms:
5 + -8 + 40a + a + 10a2 = 8 + -1a + -8 + a

Combine like terms: 5 + -8 = -3
-3 + 40a + a + 10a2 = 8 + -1a + -8 + a

Combine like terms: 40a + a = 41a
-3 + 41a + 10a2 = 8 + -1a + -8 + a

Reorder the terms:
-3 + 41a + 10a2 = 8 + -8 + -1a + a

Combine like terms: 8 + -8 = 0
-3 + 41a + 10a2 = 0 + -1a + a
-3 + 41a + 10a2 = -1a + a

Combine like terms: -1a + a = 0
-3 + 41a + 10a2 = 0

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

Divide each side by '10'.
-0.3 + 4.1a + a2 = 0.0

Move the constant term to the right:

Add '0.3' to each side of the equation.
-0.3 + 4.1a + 0.3 + a2 = 0.0 + 0.3

Reorder the terms:
-0.3 + 0.3 + 4.1a + a2 = 0.0 + 0.3

Combine like terms: -0.3 + 0.3 = 0.0
0.0 + 4.1a + a2 = 0.0 + 0.3
4.1a + a2 = 0.0 + 0.3

Combine like terms: 0.0 + 0.3 = 0.3
4.1a + a2 = 0.3

The a term is 4.1a.  Take half its coefficient (2.05).
Square it (4.2025) and add it to both sides.

Add '4.2025' to each side of the equation.
4.1a + 4.2025 + a2 = 0.3 + 4.2025

Reorder the terms:
4.2025 + 4.1a + a2 = 0.3 + 4.2025

Combine like terms: 0.3 + 4.2025 = 4.5025
4.2025 + 4.1a + a2 = 4.5025

Factor a perfect square on the left side:
(a + 2.05)(a + 2.05) = 4.5025

Calculate the square root of the right side: 2.121909517

Break this problem into two subproblems by setting 
(a + 2.05) equal to 2.121909517 and -2.121909517.

Subproblem 1

a + 2.05 = 2.121909517 Simplifying a + 2.05 = 2.121909517 Reorder the terms: 2.05 + a = 2.121909517 Solving 2.05 + a = 2.121909517 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.05' to each side of the equation. 2.05 + -2.05 + a = 2.121909517 + -2.05 Combine like terms: 2.05 + -2.05 = 0.00 0.00 + a = 2.121909517 + -2.05 a = 2.121909517 + -2.05 Combine like terms: 2.121909517 + -2.05 = 0.071909517 a = 0.071909517 Simplifying a = 0.071909517

Subproblem 2

a + 2.05 = -2.121909517 Simplifying a + 2.05 = -2.121909517 Reorder the terms: 2.05 + a = -2.121909517 Solving 2.05 + a = -2.121909517 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.05' to each side of the equation. 2.05 + -2.05 + a = -2.121909517 + -2.05 Combine like terms: 2.05 + -2.05 = 0.00 0.00 + a = -2.121909517 + -2.05 a = -2.121909517 + -2.05 Combine like terms: -2.121909517 + -2.05 = -4.171909517 a = -4.171909517 Simplifying a = -4.171909517

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.071909517, -4.171909517}

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