=2a^3+18a^2+40a

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Solution for =2a^3+18a^2+40a equation:


Simplifying
0 = 2a3 + 18a2 + 40a

Reorder the terms:
0 = 40a + 18a2 + 2a3

Solving
0 = 40a + 18a2 + 2a3

Solving for variable 'a'.
Remove the zero:
-40a + -18a2 + -2a3 = 40a + 18a2 + 2a3 + -40a + -18a2 + -2a3

Reorder the terms:
-40a + -18a2 + -2a3 = 40a + -40a + 18a2 + -18a2 + 2a3 + -2a3

Combine like terms: 40a + -40a = 0
-40a + -18a2 + -2a3 = 0 + 18a2 + -18a2 + 2a3 + -2a3
-40a + -18a2 + -2a3 = 18a2 + -18a2 + 2a3 + -2a3

Combine like terms: 18a2 + -18a2 = 0
-40a + -18a2 + -2a3 = 0 + 2a3 + -2a3
-40a + -18a2 + -2a3 = 2a3 + -2a3

Combine like terms: 2a3 + -2a3 = 0
-40a + -18a2 + -2a3 = 0

Factor out the Greatest Common Factor (GCF), '-2a'.
-2a(20 + 9a + a2) = 0

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

Ignore the factor -2.

Subproblem 1

Set the factor 'a' equal to zero and attempt to solve: Simplifying a = 0 Solving a = 0 Move all terms containing a to the left, all other terms to the right. Simplifying a = 0

Subproblem 2

Set the factor '(5 + a)' equal to zero and attempt to solve: Simplifying 5 + a = 0 Solving 5 + a = 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 + a = 0 + -5 Combine like terms: 5 + -5 = 0 0 + a = 0 + -5 a = 0 + -5 Combine like terms: 0 + -5 = -5 a = -5 Simplifying a = -5

Subproblem 3

Set the factor '(4 + a)' equal to zero and attempt to solve: Simplifying 4 + a = 0 Solving 4 + a = 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 + a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + a = 0 + -4 a = 0 + -4 Combine like terms: 0 + -4 = -4 a = -4 Simplifying a = -4

Solution

a = {0, -5, -4}

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