81x^2-121y^2=

Solution for 81x^2-121y^2= equation:

Simplifying
81x2 + -121y2 = 0

Solving
81x2 + -121y2 = 0

Solving for variable 'x'.

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

Add '121y2' to each side of the equation.
81x2 + -121y2 + 121y2 = 0 + 121y2

Combine like terms: -121y2 + 121y2 = 0
81x2 + 0 = 0 + 121y2
81x2 = 0 + 121y2
Remove the zero:
81x2 = 121y2

Divide each side by '81'.
x2 = 1.49382716y2

Simplifying
x2 = 1.49382716y2

Take the square root of each side:
x = {-1.222222222y, 1.222222222y}