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Simplifying
3n2 + -3 = 213
Reorder the terms:
-3 + 3n2 = 213
Solving
-3 + 3n2 = 213
Solving for variable 'n'.
Move all terms containing n to the left, all other terms to the right.
Add '3' to each side of the equation.
-3 + 3 + 3n2 = 213 + 3
Combine like terms: -3 + 3 = 0
0 + 3n2 = 213 + 3
3n2 = 213 + 3
Combine like terms: 213 + 3 = 216
3n2 = 216
Divide each side by '3'.
n2 = 72
Simplifying
n2 = 72
Take the square root of each side:
n = {-8.485281374, 8.485281374}
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