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Simplifying
0 = r2 + -441
Reorder the terms:
0 = -441 + r2
Solving
0 = -441 + 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.
0 + -1r2 = -441 + r2 + -1r2
Remove the zero:
-1r2 = -441 + r2 + -1r2
Combine like terms: r2 + -1r2 = 0
-1r2 = -441 + 0
-1r2 = -441
Divide each side by '-1'.
r2 = 441
Simplifying
r2 = 441
Take the square root of each side:
r = {-21, 21}
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