Factor x^2 - 4x + 5.

Prime
(x + 5)(x - 1)
(X - 5)(x - 1)
(x + 5)(x + 1)

Uhh? You can't factor this!

Step-by-step explanation:

So.. we see that the last term, the constant, (the +5) is positive, which means the two terms (the a and b on the (x+a)(x+b) must be either both positive or both negative).

We try positive, and we end up with

(x+1)(x+5)

x^2 + x + 5x + 5

x^2 + 6x + 5

which is not what we want!

We try negative, and we end up with

(x-1)(x-5)

x^2 -x -5x +5

x^2 -6x +5

which is also not what we want!

This isn't factorable!

You can always complete the square or utilize the quadratic equation, but you can't factor it.

1,645,493,059.35

step-by-step explanation: