7-r^2-31+30=

Solution for 7-r^2-31+30= equation:

Simplifying
7 + -1r2 + -31 + 30 = 0

Reorder the terms:
7 + -31 + 30 + -1r2 = 0

Combine like terms: 7 + -31 = -24
-24 + 30 + -1r2 = 0

Combine like terms: -24 + 30 = 6
6 + -1r2 = 0

Solving
6 + -1r2 = 0

Solving for variable 'r'.

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

Add '-6' to each side of the equation.
6 + -6 + -1r2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -1r2 = 0 + -6
-1r2 = 0 + -6

Combine like terms: 0 + -6 = -6
-1r2 = -6

Divide each side by '-1'.
r2 = 6

Simplifying
r2 = 6

Take the square root of each side:
r = {-2.449489743, 2.449489743}