(13a+9)(4a-12)=0

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Solution for (13a+9)(4a-12)=0 equation:


Simplifying
(13a + 9)(4a + -12) = 0

Reorder the terms:
(9 + 13a)(4a + -12) = 0

Reorder the terms:
(9 + 13a)(-12 + 4a) = 0

Multiply (9 + 13a) * (-12 + 4a)
(9(-12 + 4a) + 13a * (-12 + 4a)) = 0
((-12 * 9 + 4a * 9) + 13a * (-12 + 4a)) = 0
((-108 + 36a) + 13a * (-12 + 4a)) = 0
(-108 + 36a + (-12 * 13a + 4a * 13a)) = 0
(-108 + 36a + (-156a + 52a2)) = 0

Combine like terms: 36a + -156a = -120a
(-108 + -120a + 52a2) = 0

Solving
-108 + -120a + 52a2 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-27 + -30a + 13a2) = 0

Factor a trinomial.
4((-9 + -13a)(3 + -1a)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-9 + -13a)' equal to zero and attempt to solve: Simplifying -9 + -13a = 0 Solving -9 + -13a = 0 Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -13a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -13a = 0 + 9 -13a = 0 + 9 Combine like terms: 0 + 9 = 9 -13a = 9 Divide each side by '-13'. a = -0.6923076923 Simplifying a = -0.6923076923

Subproblem 2

Set the factor '(3 + -1a)' equal to zero and attempt to solve: Simplifying 3 + -1a = 0 Solving 3 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1a = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1a = 0 + -3 -1a = 0 + -3 Combine like terms: 0 + -3 = -3 -1a = -3 Divide each side by '-1'. a = 3 Simplifying a = 3

Solution

a = {-0.6923076923, 3}

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