4-(9x*x)=0

Solution for 4-(9x*x)=0 equation:

Simplifying
4 + -1(9x * x) = 0

Multiply x * x
4 + -1(9x2) = 0

Remove parenthesis around (9x2)
4 + -1 * 9x2 = 0

Multiply -1 * 9
4 + -9x2 = 0

Solving
4 + -9x2 = 0

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + -9x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -9x2 = 0 + -4
-9x2 = 0 + -4

Combine like terms: 0 + -4 = -4
-9x2 = -4

Divide each side by '-9'.
x2 = 0.4444444444

Simplifying
x2 = 0.4444444444

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