Do you mean
x = x^2 ?
If so, you can write this as a quadratic
x^2 - x = 0
x(x - 1) = 0
The roots are x = 0 and x = 1.
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The factors of x2 are x and x x times x plus 1 = x2 + x
Answer: x (x2-x)
x2 + 49 = x2 - (-49) = x2 - (-1)(49) = x2 - (i2)(72) = x2 - (7i)2 = (x - 7i)(x + 7i) where i is the imaginary square root of -1.
x2 - (2x)2 = x2 - 4x2 = -3x2 x2 - 2x2 = -x2
-x2 = x - 6 x2 + x - 6 = 0 (x - 2)(x + 3) = 0 x ∈ {-3, 2}