-3(a-2)-a^2=8a

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


Simplifying
-3(a + -2) + -1a2 = 8a

Reorder the terms:
-3(-2 + a) + -1a2 = 8a
(-2 * -3 + a * -3) + -1a2 = 8a
(6 + -3a) + -1a2 = 8a

Solving
6 + -3a + -1a2 = 8a

Solving for variable 'a'.

Reorder the terms:
6 + -3a + -8a + -1a2 = 8a + -8a

Combine like terms: -3a + -8a = -11a
6 + -11a + -1a2 = 8a + -8a

Combine like terms: 8a + -8a = 0
6 + -11a + -1a2 = 0

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

Divide each side by '-1'.
-6 + 11a + a2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 11a + 6 + a2 = 0 + 6

Reorder the terms:
-6 + 6 + 11a + a2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 11a + a2 = 0 + 6
11a + a2 = 0 + 6

Combine like terms: 0 + 6 = 6
11a + a2 = 6

The a term is 11a.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11a + 30.25 + a2 = 6 + 30.25

Reorder the terms:
30.25 + 11a + a2 = 6 + 30.25

Combine like terms: 6 + 30.25 = 36.25
30.25 + 11a + a2 = 36.25

Factor a perfect square on the left side:
(a + 5.5)(a + 5.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(a + 5.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

a + 5.5 = 6.020797289 Simplifying a + 5.5 = 6.020797289 Reorder the terms: 5.5 + a = 6.020797289 Solving 5.5 + a = 6.020797289 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + a = 6.020797289 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + a = 6.020797289 + -5.5 a = 6.020797289 + -5.5 Combine like terms: 6.020797289 + -5.5 = 0.520797289 a = 0.520797289 Simplifying a = 0.520797289

Subproblem 2

a + 5.5 = -6.020797289 Simplifying a + 5.5 = -6.020797289 Reorder the terms: 5.5 + a = -6.020797289 Solving 5.5 + a = -6.020797289 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + a = -6.020797289 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + a = -6.020797289 + -5.5 a = -6.020797289 + -5.5 Combine like terms: -6.020797289 + -5.5 = -11.520797289 a = -11.520797289 Simplifying a = -11.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.520797289, -11.520797289}

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