[2a-8][a+5]=0

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Solution for [2a-8][a+5]=0 equation:


Simplifying
[2a + -8][a + 5] = 0

Reorder the terms:
[-8 + 2a][a + 5] = 0

Reorder the terms:
[-8 + 2a][5 + a] = 0

Multiply [-8 + 2a] * [5 + a]
[-8[5 + a] + 2a * [5 + a]] = 0
[[5 * -8 + a * -8] + 2a * [5 + a]] = 0
[[-40 + -8a] + 2a * [5 + a]] = 0
[-40 + -8a + [5 * 2a + a * 2a]] = 0
[-40 + -8a + [10a + 2a2]] = 0

Combine like terms: -8a + 10a = 2a
[-40 + 2a + 2a2] = 0

Solving
-40 + 2a + 2a2 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-20 + a + a2) = 0

Factor a trinomial.
2((-5 + -1a)(4 + -1a)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-5 + -1a)' equal to zero and attempt to solve: Simplifying -5 + -1a = 0 Solving -5 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1a = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1a = 0 + 5 -1a = 0 + 5 Combine like terms: 0 + 5 = 5 -1a = 5 Divide each side by '-1'. a = -5 Simplifying a = -5

Subproblem 2

Set the factor '(4 + -1a)' equal to zero and attempt to solve: Simplifying 4 + -1a = 0 Solving 4 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1a = 0 + -4 -1a = 0 + -4 Combine like terms: 0 + -4 = -4 -1a = -4 Divide each side by '-1'. a = 4 Simplifying a = 4

Solution

a = {-5, 4}

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