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Simplifying
4y2 + 18 = 81
Reorder the terms:
18 + 4y2 = 81
Solving
18 + 4y2 = 81
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '-18' to each side of the equation.
18 + -18 + 4y2 = 81 + -18
Combine like terms: 18 + -18 = 0
0 + 4y2 = 81 + -18
4y2 = 81 + -18
Combine like terms: 81 + -18 = 63
4y2 = 63
Divide each side by '4'.
y2 = 15.75
Simplifying
y2 = 15.75
Take the square root of each side:
y = {-3.968626967, 3.968626967}
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