4n*3n-15=90

Solution for 4n*3n-15=90 equation:

Simplifying
4n * 3n + -15 = 90

Reorder the terms for easier multiplication:
4 * 3n * n + -15 = 90

Multiply 4 * 3
12n * n + -15 = 90

Multiply n * n
12n2 + -15 = 90

Reorder the terms:
-15 + 12n2 = 90

Solving
-15 + 12n2 = 90

Solving for variable 'n'.

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

Add '15' to each side of the equation.
-15 + 15 + 12n2 = 90 + 15

Combine like terms: -15 + 15 = 0
0 + 12n2 = 90 + 15
12n2 = 90 + 15

Combine like terms: 90 + 15 = 105
12n2 = 105

Divide each side by '12'.
n2 = 8.75

Simplifying
n2 = 8.75

Take the square root of each side:
n = {-2.958039892, 2.958039892}