3n(7n-4n)=81

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Solution for 3n(7n-4n)=81 equation: 


Simplifying
3n(7n + -4n) = 81

Combine like terms: 7n + -4n = 3n
3n(3n) = 81

Remove parenthesis around (3n)
3n * 3n = 81

Reorder the terms for easier multiplication:
3 * 3n * n = 81

Multiply 3 * 3
9n * n = 81

Multiply n * n
9n2 = 81

Solving
9n2 = 81

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Divide each side by '9'.
n2 = 9

Simplifying
n2 = 9

Take the square root of each side:
n = {-3, 3}

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