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Simplifying
2(a2) + -4 = 68
Reorder the terms:
-4 + 2a2 = 68
Solving
-4 + 2a2 = 68
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 + 2a2 = 68 + 4
Combine like terms: -4 + 4 = 0
0 + 2a2 = 68 + 4
2a2 = 68 + 4
Combine like terms: 68 + 4 = 72
2a2 = 72
Divide each side by '2'.
a2 = 36
Simplifying
a2 = 36
Take the square root of each side:
a = {-6, 6}
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