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Simplifying
81y2 + -324 = 0
Reorder the terms:
-324 + 81y2 = 0
Solving
-324 + 81y2 = 0
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '324' to each side of the equation.
-324 + 324 + 81y2 = 0 + 324
Combine like terms: -324 + 324 = 0
0 + 81y2 = 0 + 324
81y2 = 0 + 324
Combine like terms: 0 + 324 = 324
81y2 = 324
Divide each side by '81'.
y2 = 4
Simplifying
y2 = 4
Take the square root of each side:
y = {-2, 2}
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