[2+4a]2=21

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Solution for [2+4a]2=21 equation:


Simplifying
[2 + 4a] * 2 = 21

Reorder the terms for easier multiplication:
2[2 + 4a] = 21
[2 * 2 + 4a * 2] = 21
[4 + 8a] = 21

Solving
4 + 8a = 21

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + 8a = 21 + -4

Combine like terms: 4 + -4 = 0
0 + 8a = 21 + -4
8a = 21 + -4

Combine like terms: 21 + -4 = 17
8a = 17

Divide each side by '8'.
a = 2.125

Simplifying
a = 2.125

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