(1+2)2=a

Solution for (1+2)2=a equation:

Simplifying
(1 + 2) * 2 = a

Combine like terms: 1 + 2 = 3
(3) * 2 = a

Multiply 3 * 2
6 = a

Solving
6 = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
6 + -1a = a + -1a

Combine like terms: a + -1a = 0
6 + -1a = 0

Add '-6' to each side of the equation.
6 + -6 + -1a = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -1a = 0 + -6
-1a = 0 + -6

Combine like terms: 0 + -6 = -6
-1a = -6

Divide each side by '-1'.
a = 6

Simplifying
a = 6