(7a+9)(a-8)+(14a-16)(a-8)=

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Solution for (7a+9)(a-8)+(14a-16)(a-8)= equation:


Simplifying
(7a + 9)(a + -8) + (14a + -16)(a + -8) = 0

Reorder the terms:
(9 + 7a)(a + -8) + (14a + -16)(a + -8) = 0

Reorder the terms:
(9 + 7a)(-8 + a) + (14a + -16)(a + -8) = 0

Multiply (9 + 7a) * (-8 + a)
(9(-8 + a) + 7a * (-8 + a)) + (14a + -16)(a + -8) = 0
((-8 * 9 + a * 9) + 7a * (-8 + a)) + (14a + -16)(a + -8) = 0
((-72 + 9a) + 7a * (-8 + a)) + (14a + -16)(a + -8) = 0
(-72 + 9a + (-8 * 7a + a * 7a)) + (14a + -16)(a + -8) = 0
(-72 + 9a + (-56a + 7a2)) + (14a + -16)(a + -8) = 0

Combine like terms: 9a + -56a = -47a
(-72 + -47a + 7a2) + (14a + -16)(a + -8) = 0

Reorder the terms:
-72 + -47a + 7a2 + (-16 + 14a)(a + -8) = 0

Reorder the terms:
-72 + -47a + 7a2 + (-16 + 14a)(-8 + a) = 0

Multiply (-16 + 14a) * (-8 + a)
-72 + -47a + 7a2 + (-16(-8 + a) + 14a * (-8 + a)) = 0
-72 + -47a + 7a2 + ((-8 * -16 + a * -16) + 14a * (-8 + a)) = 0
-72 + -47a + 7a2 + ((128 + -16a) + 14a * (-8 + a)) = 0
-72 + -47a + 7a2 + (128 + -16a + (-8 * 14a + a * 14a)) = 0
-72 + -47a + 7a2 + (128 + -16a + (-112a + 14a2)) = 0

Combine like terms: -16a + -112a = -128a
-72 + -47a + 7a2 + (128 + -128a + 14a2) = 0

Reorder the terms:
-72 + 128 + -47a + -128a + 7a2 + 14a2 = 0

Combine like terms: -72 + 128 = 56
56 + -47a + -128a + 7a2 + 14a2 = 0

Combine like terms: -47a + -128a = -175a
56 + -175a + 7a2 + 14a2 = 0

Combine like terms: 7a2 + 14a2 = 21a2
56 + -175a + 21a2 = 0

Solving
56 + -175a + 21a2 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '7'.
7(8 + -25a + 3a2) = 0

Factor a trinomial.
7((1 + -3a)(8 + -1a)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(1 + -3a)' equal to zero and attempt to solve: Simplifying 1 + -3a = 0 Solving 1 + -3a = 0 Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3a = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3a = 0 + -1 -3a = 0 + -1 Combine like terms: 0 + -1 = -1 -3a = -1 Divide each side by '-3'. a = 0.3333333333 Simplifying a = 0.3333333333

Subproblem 2

Set the factor '(8 + -1a)' equal to zero and attempt to solve: Simplifying 8 + -1a = 0 Solving 8 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1a = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1a = 0 + -8 -1a = 0 + -8 Combine like terms: 0 + -8 = -8 -1a = -8 Divide each side by '-1'. a = 8 Simplifying a = 8

Solution

a = {0.3333333333, 8}

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