(1.)
factor the expression over the complex numbers.
x^2 + 50

(2.)
factor the expression over the complex numbers.
x^2 + 25

(3.)
factor the expression completely over the complex numbers.
x^4 - 625

(4.)
factor the expression completely over the complex numbers.
x^4 + 10x^2 + 25

(5.)
factor the expression completely over the complex numbers.
y^3 + 2y^2 + 16y + 32