4=9v^2

Solution for 4=9v^2 equation:

Simplifying
4 = 9v2

Solving
4 = 9v2

Solving for variable 'v'.

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

Add '-9v2' to each side of the equation.
4 + -9v2 = 9v2 + -9v2

Combine like terms: 9v2 + -9v2 = 0
4 + -9v2 = 0

Add '-4' to each side of the equation.
4 + -4 + -9v2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -9v2 = 0 + -4
-9v2 = 0 + -4

Combine like terms: 0 + -4 = -4
-9v2 = -4

Divide each side by '-9'.
v2 = 0.4444444444

Simplifying
v2 = 0.4444444444

Take the square root of each side:
v = {-0.666666667, 0.666666667}