141.3=15.7(r*r)

Solution for 141.3=15.7(r*r) equation:

Simplifying
141.3 = 15.7(r * r)

Multiply r * r
141.3 = 15.7(r2)

Solving
141.3 = 15.7r2

Solving for variable 'r'.

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

Add '-15.7r2' to each side of the equation.
141.3 + -15.7r2 = 15.7r2 + -15.7r2

Combine like terms: 15.7r2 + -15.7r2 = 0.0
141.3 + -15.7r2 = 0.0

Add '-141.3' to each side of the equation.
141.3 + -141.3 + -15.7r2 = 0.0 + -141.3

Combine like terms: 141.3 + -141.3 = 0.0
0.0 + -15.7r2 = 0.0 + -141.3
-15.7r2 = 0.0 + -141.3

Combine like terms: 0.0 + -141.3 = -141.3
-15.7r2 = -141.3

Divide each side by '-15.7'.
r2 = 9

Simplifying
r2 = 9

Take the square root of each side:
r = {-3, 3}