r^2+1=20

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Solution for r^2+1=20 equation: 


Simplifying
r2 + 1 = 20

Reorder the terms:
1 + r2 = 20

Solving
1 + r2 = 20

Solving for variable 'r'.

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

Add '-1' to each side of the equation.
1 + -1 + r2 = 20 + -1

Combine like terms: 1 + -1 = 0
0 + r2 = 20 + -1
r2 = 20 + -1

Combine like terms: 20 + -1 = 19
r2 = 19

Simplifying
r2 = 19

Take the square root of each side:
r = {-4.358898944, 4.358898944}

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