r^2+9=16

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Solution for r^2+9=16 equation: 


Simplifying
r2 + 9 = 16

Reorder the terms:
9 + r2 = 16

Solving
9 + r2 = 16

Solving for variable 'r'.

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

Add '-9' to each side of the equation.
9 + -9 + r2 = 16 + -9

Combine like terms: 9 + -9 = 0
0 + r2 = 16 + -9
r2 = 16 + -9

Combine like terms: 16 + -9 = 7
r2 = 7

Simplifying
r2 = 7

Take the square root of each side:
r = {-2.645751311, 2.645751311}

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