Question

Which polynomial is prime?

x2 – 36

x2 + 16

x2 – 7x + 12

x2 – x – 20

Answer 1

x^2+16

Explanation:

Answer 2

x2+16 is the prime polynomial.
x2+16 is the only polynomial that couldn't be factored out anymore

x2-36 --> (x-6)(x+6)
x2-7x+12 --> (x-3)(x-4)
x2-x-20 --> (x+5)(x-4)