(a+3)(a-4)=8

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Solution for (a+3)(a-4)=8 equation:


Simplifying
(a + 3)(a + -4) = 8

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

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

Multiply (3 + a) * (-4 + a)
(3(-4 + a) + a(-4 + a)) = 8
((-4 * 3 + a * 3) + a(-4 + a)) = 8
((-12 + 3a) + a(-4 + a)) = 8
(-12 + 3a + (-4 * a + a * a)) = 8
(-12 + 3a + (-4a + a2)) = 8

Combine like terms: 3a + -4a = -1a
(-12 + -1a + a2) = 8

Solving
-12 + -1a + a2 = 8

Solving for variable 'a'.

Reorder the terms:
-12 + -8 + -1a + a2 = 8 + -8

Combine like terms: -12 + -8 = -20
-20 + -1a + a2 = 8 + -8

Combine like terms: 8 + -8 = 0
-20 + -1a + a2 = 0

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

Subproblem 1

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

Subproblem 2

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

Solution

a = {-4, 5}

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