Question

Which expression is prime?
A)x^2 - 9

B)1 - 9x^2

C)2a^2 - 25

D)4x^2 - 9

Answer 1

which one can you not factor out

Answer 2

C :D

Answer 3

it looks like there are more than one that can't get factored out

Answer 4

u can factor out A and get (x-3)(x+3)

Answer 5

for the rest of them, i could not factor it to get the right answer