(A-8)(A+2)=2

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Solution for (A-8)(A+2)=2 equation:


Simplifying
(A + -8)(A + 2) = 2

Reorder the terms:
(-8 + A)(A + 2) = 2

Reorder the terms:
(-8 + A)(2 + A) = 2

Multiply (-8 + A) * (2 + A)
(-8(2 + A) + A(2 + A)) = 2
((2 * -8 + A * -8) + A(2 + A)) = 2
((-16 + -8A) + A(2 + A)) = 2
(-16 + -8A + (2 * A + A * A)) = 2
(-16 + -8A + (2A + A2)) = 2

Combine like terms: -8A + 2A = -6A
(-16 + -6A + A2) = 2

Solving
-16 + -6A + A2 = 2

Solving for variable 'A'.

Reorder the terms:
-16 + -2 + -6A + A2 = 2 + -2

Combine like terms: -16 + -2 = -18
-18 + -6A + A2 = 2 + -2

Combine like terms: 2 + -2 = 0
-18 + -6A + A2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -6A + 18 + A2 = 0 + 18

Reorder the terms:
-18 + 18 + -6A + A2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -6A + A2 = 0 + 18
-6A + A2 = 0 + 18

Combine like terms: 0 + 18 = 18
-6A + A2 = 18

The A term is -6A.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6A + 9 + A2 = 18 + 9

Reorder the terms:
9 + -6A + A2 = 18 + 9

Combine like terms: 18 + 9 = 27
9 + -6A + A2 = 27

Factor a perfect square on the left side:
(A + -3)(A + -3) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(A + -3) equal to 5.196152423 and -5.196152423.

Subproblem 1

A + -3 = 5.196152423 Simplifying A + -3 = 5.196152423 Reorder the terms: -3 + A = 5.196152423 Solving -3 + A = 5.196152423 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + A = 5.196152423 + 3 Combine like terms: -3 + 3 = 0 0 + A = 5.196152423 + 3 A = 5.196152423 + 3 Combine like terms: 5.196152423 + 3 = 8.196152423 A = 8.196152423 Simplifying A = 8.196152423

Subproblem 2

A + -3 = -5.196152423 Simplifying A + -3 = -5.196152423 Reorder the terms: -3 + A = -5.196152423 Solving -3 + A = -5.196152423 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + A = -5.196152423 + 3 Combine like terms: -3 + 3 = 0 0 + A = -5.196152423 + 3 A = -5.196152423 + 3 Combine like terms: -5.196152423 + 3 = -2.196152423 A = -2.196152423 Simplifying A = -2.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. A = {8.196152423, -2.196152423}

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