15-(a+8)a=3

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Solution for 15-(a+8)a=3 equation:


Simplifying
15 + -1(a + 8) * a = 3

Reorder the terms:
15 + -1(8 + a) * a = 3

Reorder the terms for easier multiplication:
15 + -1a(8 + a) = 3
15 + (8 * -1a + a * -1a) = 3
15 + (-8a + -1a2) = 3

Solving
15 + -8a + -1a2 = 3

Solving for variable 'a'.

Reorder the terms:
15 + -3 + -8a + -1a2 = 3 + -3

Combine like terms: 15 + -3 = 12
12 + -8a + -1a2 = 3 + -3

Combine like terms: 3 + -3 = 0
12 + -8a + -1a2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-12 + 8a + a2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 8a + 12 + a2 = 0 + 12

Reorder the terms:
-12 + 12 + 8a + a2 = 0 + 12

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

Combine like terms: 0 + 12 = 12
8a + a2 = 12

The a term is 8a.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8a + 16 + a2 = 12 + 16

Reorder the terms:
16 + 8a + a2 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + 8a + a2 = 28

Factor a perfect square on the left side:
(a + 4)(a + 4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(a + 4) equal to 5.291502622 and -5.291502622.

Subproblem 1

a + 4 = 5.291502622 Simplifying a + 4 = 5.291502622 Reorder the terms: 4 + a = 5.291502622 Solving 4 + a = 5.291502622 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + a = 5.291502622 + -4 Combine like terms: 4 + -4 = 0 0 + a = 5.291502622 + -4 a = 5.291502622 + -4 Combine like terms: 5.291502622 + -4 = 1.291502622 a = 1.291502622 Simplifying a = 1.291502622

Subproblem 2

a + 4 = -5.291502622 Simplifying a + 4 = -5.291502622 Reorder the terms: 4 + a = -5.291502622 Solving 4 + a = -5.291502622 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + a = -5.291502622 + -4 Combine like terms: 4 + -4 = 0 0 + a = -5.291502622 + -4 a = -5.291502622 + -4 Combine like terms: -5.291502622 + -4 = -9.291502622 a = -9.291502622 Simplifying a = -9.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.291502622, -9.291502622}

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