81x^2-4y^2=

Solution for 81x^2-4y^2= equation:

Simplifying
81x2 + -4y2 = 0

Solving
81x2 + -4y2 = 0

Solving for variable 'x'.

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

Add '4y2' to each side of the equation.
81x2 + -4y2 + 4y2 = 0 + 4y2

Combine like terms: -4y2 + 4y2 = 0
81x2 + 0 = 0 + 4y2
81x2 = 0 + 4y2
Remove the zero:
81x2 = 4y2

Divide each side by '81'.
x2 = 0.04938271605y2

Simplifying
x2 = 0.04938271605y2

Take the square root of each side:
x = {-0.222222222y, 0.222222222y}