Question

Which expression is prime?
A)x(squared) - 9
B)1 - 9x(squared)
C)2a(squared) - 25
D)4x(squared) - 9

Answer 1

\[x^2-9=(x+3)(x-3)\] so not that one

Answer 2

huh

Answer 3

prime = can not be factored

Answer 4

so what @satellite73 was saying is that x^2 - 9 is not prime; thus it is factorable

Answer 5

oh but i dont see how im supposed to figure it out when i dont know what X is

Answer 6

xD
this is what they are saying