9x^2-1=7

Solution for 9x^2-1=7 equation:

Simplifying
9x2 + -1 = 7

Reorder the terms:
-1 + 9x2 = 7

Solving
-1 + 9x2 = 7

Solving for variable 'x'.

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

Add '1' to each side of the equation.
-1 + 1 + 9x2 = 7 + 1

Combine like terms: -1 + 1 = 0
0 + 9x2 = 7 + 1
9x2 = 7 + 1

Combine like terms: 7 + 1 = 8
9x2 = 8

Divide each side by '9'.
x2 = 0.8888888889

Simplifying
x2 = 0.8888888889

Take the square root of each side:
x = {-0.942809042, 0.942809042}