3n*3n-0.75=90

Solution for 3n*3n-0.75=90 equation:

Simplifying
3n * 3n + -0.75 = 90

Reorder the terms for easier multiplication:
3 * 3n * n + -0.75 = 90

Multiply 3 * 3
9n * n + -0.75 = 90

Multiply n * n
9n2 + -0.75 = 90

Reorder the terms:
-0.75 + 9n2 = 90

Solving
-0.75 + 9n2 = 90

Solving for variable 'n'.

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

Add '0.75' to each side of the equation.
-0.75 + 0.75 + 9n2 = 90 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 9n2 = 90 + 0.75
9n2 = 90 + 0.75

Combine like terms: 90 + 0.75 = 90.75
9n2 = 90.75

Divide each side by '9'.
n2 = 10.08333333

Simplifying
n2 = 10.08333333

Take the square root of each side:
n = {-3.17542648, 3.17542648}