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Simplifying
90 = n2 + 81
Reorder the terms:
90 = 81 + n2
Solving
90 = 81 + n2
Solving for variable 'n'.
Move all terms containing n to the left, all other terms to the right.
Add '-1n2' to each side of the equation.
90 + -1n2 = 81 + n2 + -1n2
Combine like terms: n2 + -1n2 = 0
90 + -1n2 = 81 + 0
90 + -1n2 = 81
Add '-90' to each side of the equation.
90 + -90 + -1n2 = 81 + -90
Combine like terms: 90 + -90 = 0
0 + -1n2 = 81 + -90
-1n2 = 81 + -90
Combine like terms: 81 + -90 = -9
-1n2 = -9
Divide each side by '-1'.
n2 = 9
Simplifying
n2 = 9
Take the square root of each side:
n = {-3, 3}
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