x*x-9+x*x=4

Solution for x*x-9+x*x=4 equation:

Simplifying
x * x + -9 + x * x = 4

Multiply x * x
x2 + -9 + x * x = 4

Multiply x * x
x2 + -9 + x2 = 4

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

Combine like terms: x2 + x2 = 2x2
-9 + 2x2 = 4

Solving
-9 + 2x2 = 4

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 + 2x2 = 4 + 9

Combine like terms: -9 + 9 = 0
0 + 2x2 = 4 + 9
2x2 = 4 + 9

Combine like terms: 4 + 9 = 13
2x2 = 13

Divide each side by '2'.
x2 = 6.5

Simplifying
x2 = 6.5

Take the square root of each side:
x = {-2.549509757, 2.549509757}