r^2-15=

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Solution for r^2-15= equation: 


Simplifying
r2 + -15 = 0

Reorder the terms:
-15 + r2 = 0

Solving
-15 + r2 = 0

Solving for variable 'r'.

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

Add '15' to each side of the equation.
-15 + 15 + r2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + r2 = 0 + 15
r2 = 0 + 15

Combine like terms: 0 + 15 = 15
r2 = 15

Simplifying
r2 = 15

Take the square root of each side:
r = {-3.872983346, 3.872983346}

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