7.5=r^2

Solution for 7.5=r^2 equation:

Simplifying
7.5 = r2

Solving
7.5 = r2

Solving for variable 'r'.

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

Add '-1r2' to each side of the equation.
7.5 + -1r2 = r2 + -1r2

Combine like terms: r2 + -1r2 = 0
7.5 + -1r2 = 0

Add '-7.5' to each side of the equation.
7.5 + -7.5 + -1r2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -1r2 = 0 + -7.5
-1r2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-1r2 = -7.5

Divide each side by '-1'.
r2 = 7.5

Simplifying
r2 = 7.5

Take the square root of each side:
r = {-2.738612788, 2.738612788}