4a^2+18a+5=15

Solution for 4a^2+18a+5=15 equation:

Simplifying
4a2 + 18a + 5 = 15

Reorder the terms:
5 + 18a + 4a2 = 15

Solving
5 + 18a + 4a2 = 15

Solving for variable 'a'.

Reorder the terms:
5 + -15 + 18a + 4a2 = 15 + -15

Combine like terms: 5 + -15 = -10
-10 + 18a + 4a2 = 15 + -15

Combine like terms: 15 + -15 = 0
-10 + 18a + 4a2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-5 + 9a + 2a2) = 0

Factor a trinomial.
2((-5 + -1a)(1 + -2a)) = 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 '(1 + -2a)' equal to zero and attempt to solve:

Simplifying
1 + -2a = 0

Solving
1 + -2a = 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 + -2a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2a = 0 + -1
-2a = 0 + -1

Combine like terms: 0 + -1 = -1
-2a = -1

Divide each side by '-2'.
a = 0.5

Simplifying
a = 0.5
Solution
a = {-5, 0.5}