r^2-9t^2=0

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Solution for r^2-9t^2=0 equation: 


Simplifying
r2 + -9t2 = 0

Solving
r2 + -9t2 = 0

Solving for variable 'r'.

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

Add '9t2' to each side of the equation.
r2 + -9t2 + 9t2 = 0 + 9t2

Combine like terms: -9t2 + 9t2 = 0
r2 + 0 = 0 + 9t2
r2 = 0 + 9t2
Remove the zero:
r2 = 9t2

Simplifying
r2 = 9t2

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

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