-r^2-12+45=

Solution for -r^2-12+45= equation:

Simplifying
-1r2 + -12 + 45 = 0

Reorder the terms:
-12 + 45 + -1r2 = 0

Combine like terms: -12 + 45 = 33
33 + -1r2 = 0

Solving
33 + -1r2 = 0

Solving for variable 'r'.

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

Add '-33' to each side of the equation.
33 + -33 + -1r2 = 0 + -33

Combine like terms: 33 + -33 = 0
0 + -1r2 = 0 + -33
-1r2 = 0 + -33

Combine like terms: 0 + -33 = -33
-1r2 = -33

Divide each side by '-1'.
r2 = 33

Simplifying
r2 = 33

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