(a-4)(a-8)=-2

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Solution for (a-4)(a-8)=-2 equation:


Simplifying
(a + -4)(a + -8) = -2

Reorder the terms:
(-4 + a)(a + -8) = -2

Reorder the terms:
(-4 + a)(-8 + a) = -2

Multiply (-4 + a) * (-8 + a)
(-4(-8 + a) + a(-8 + a)) = -2
((-8 * -4 + a * -4) + a(-8 + a)) = -2
((32 + -4a) + a(-8 + a)) = -2
(32 + -4a + (-8 * a + a * a)) = -2
(32 + -4a + (-8a + a2)) = -2

Combine like terms: -4a + -8a = -12a
(32 + -12a + a2) = -2

Solving
32 + -12a + a2 = -2

Solving for variable 'a'.

Reorder the terms:
32 + 2 + -12a + a2 = -2 + 2

Combine like terms: 32 + 2 = 34
34 + -12a + a2 = -2 + 2

Combine like terms: -2 + 2 = 0
34 + -12a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-34' to each side of the equation.
34 + -12a + -34 + a2 = 0 + -34

Reorder the terms:
34 + -34 + -12a + a2 = 0 + -34

Combine like terms: 34 + -34 = 0
0 + -12a + a2 = 0 + -34
-12a + a2 = 0 + -34

Combine like terms: 0 + -34 = -34
-12a + a2 = -34

The a term is -12a.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12a + 36 + a2 = -34 + 36

Reorder the terms:
36 + -12a + a2 = -34 + 36

Combine like terms: -34 + 36 = 2
36 + -12a + a2 = 2

Factor a perfect square on the left side:
(a + -6)(a + -6) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(a + -6) equal to 1.414213562 and -1.414213562.

Subproblem 1

a + -6 = 1.414213562 Simplifying a + -6 = 1.414213562 Reorder the terms: -6 + a = 1.414213562 Solving -6 + a = 1.414213562 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + a = 1.414213562 + 6 Combine like terms: -6 + 6 = 0 0 + a = 1.414213562 + 6 a = 1.414213562 + 6 Combine like terms: 1.414213562 + 6 = 7.414213562 a = 7.414213562 Simplifying a = 7.414213562

Subproblem 2

a + -6 = -1.414213562 Simplifying a + -6 = -1.414213562 Reorder the terms: -6 + a = -1.414213562 Solving -6 + a = -1.414213562 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + a = -1.414213562 + 6 Combine like terms: -6 + 6 = 0 0 + a = -1.414213562 + 6 a = -1.414213562 + 6 Combine like terms: -1.414213562 + 6 = 4.585786438 a = 4.585786438 Simplifying a = 4.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. a = {7.414213562, 4.585786438}

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