9x^2-13x^2+4=0

Solution for 9x^2-13x^2+4=0 equation:

Simplifying
9x2 + -13x2 + 4 = 0

Reorder the terms:
4 + 9x2 + -13x2 = 0

Combine like terms: 9x2 + -13x2 = -4x2
4 + -4x2 = 0

Solving
4 + -4x2 = 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 + -4x2 = 0 + -4

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

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

Divide each side by '-4'.
x2 = 1

Simplifying
x2 = 1

Take the square root of each side:
x = {-1, 1}