9x^2-x^2-3=0

Solution for 9x^2-x^2-3=0 equation:

Simplifying
9x2 + -1x2 + -3 = 0

Reorder the terms:
-3 + 9x2 + -1x2 = 0

Combine like terms: 9x2 + -1x2 = 8x2
-3 + 8x2 = 0

Solving
-3 + 8x2 = 0

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 8x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 8x2 = 0 + 3
8x2 = 0 + 3

Combine like terms: 0 + 3 = 3
8x2 = 3

Divide each side by '8'.
x2 = 0.375

Simplifying
x2 = 0.375

Take the square root of each side:
x = {-0.612372436, 0.612372436}