Question

Factor completely: x2 − 4x + 9

(x − 1)(x − 9)

(x − 3)(x − 3)

(x + 3)(x − 3)

Prime

Answer 1

I see it as prime :/

Answer 2

How can we factor this?

Answer 3

You can even multiply all options, and you won't get the desired result.

Answer 4

if b^2-4ac is not a perfect square, the expression is prime

Answer 5

Yes, the discriminant.