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Simplifying
72a2 + -8 = 0
Reorder the terms:
-8 + 72a2 = 0
Solving
-8 + 72a2 = 0
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '8' to each side of the equation.
-8 + 8 + 72a2 = 0 + 8
Combine like terms: -8 + 8 = 0
0 + 72a2 = 0 + 8
72a2 = 0 + 8
Combine like terms: 0 + 8 = 8
72a2 = 8
Divide each side by '72'.
a2 = 0.1111111111
Simplifying
a2 = 0.1111111111
Take the square root of each side:
a = {-0.333333333, 0.333333333}
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