n^2-16-21=-4

Solution for n^2-16-21=-4 equation:

Simplifying
n2 + -16 + -21 = -4

Reorder the terms:
-16 + -21 + n2 = -4

Combine like terms: -16 + -21 = -37
-37 + n2 = -4

Solving
-37 + n2 = -4

Solving for variable 'n'.

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

Add '37' to each side of the equation.
-37 + 37 + n2 = -4 + 37

Combine like terms: -37 + 37 = 0
0 + n2 = -4 + 37
n2 = -4 + 37

Combine like terms: -4 + 37 = 33
n2 = 33

Simplifying
n2 = 33

Take the square root of each side:
n = {-5.744562647, 5.744562647}