(3+12a)2-20=

Solution for (3+12a)2-20= equation:

Simplifying
(3 + 12a) * 2 + -20 = 0

Reorder the terms for easier multiplication:
2(3 + 12a) + -20 = 0
(3 * 2 + 12a * 2) + -20 = 0
(6 + 24a) + -20 = 0

Reorder the terms:
6 + -20 + 24a = 0

Combine like terms: 6 + -20 = -14
-14 + 24a = 0

Solving
-14 + 24a = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '14' to each side of the equation.
-14 + 14 + 24a = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 24a = 0 + 14
24a = 0 + 14

Combine like terms: 0 + 14 = 14
24a = 14

Divide each side by '24'.
a = 0.5833333333

Simplifying
a = 0.5833333333