[3x(x)]-9=0

Solution for [3x(x)]-9=0 equation:

Simplifying
[3x(x)] + -9 = 0

Multiply x * x
[3x2] + -9 = 0

Reorder the terms:
-9 + [3x2] = 0

Solving
-9 + [3x2] = 0

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + [3x2] = 0 + 9

Combine like terms: -9 + 9 = 0
0 + [3x2] = 0 + 9
[3x2] = 0 + 9

Combine like terms: 0 + 9 = 9
[3x2] = 9

Divide each side by '3'.
x2 = 3

Simplifying
x2 = 3

Take the square root of each side:
x = {-1.732050808, 1.732050808}