t^2-81v^2=0

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Solution for t^2-81v^2=0 equation: 


Simplifying
t2 + -81v2 = 0

Solving
t2 + -81v2 = 0

Solving for variable 't'.

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

Add '81v2' to each side of the equation.
t2 + -81v2 + 81v2 = 0 + 81v2

Combine like terms: -81v2 + 81v2 = 0
t2 + 0 = 0 + 81v2
t2 = 0 + 81v2
Remove the zero:
t2 = 81v2

Simplifying
t2 = 81v2

Take the square root of each side:
t = {-9v, 9v}

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