Question

What is the difference of squares of x squared + 25

Answer 1

I think its x^2 - 25 ( as its a difference)

This factors to (x - 5)(x + 5) Answer

Answer 2

x² + 25 = x²- (-25)

The square root of -25 is imaginary, so this is factored using complex numbers as
(x -5i)*(x +5i)