shouldnt the 18 be -18 because if u do -1 x 18 you get -18 or am i missing out on something

[jolly notch]

I dont know what weird vooodoo your teacher is trying to teach you

But when you expand (x+1)(-x+19) do you find -x^2+18x+19?

If yes then the factorization is correct

If you dont know how the factorization was found, I think it may be time to discuss the "method" to find it

[swift oasis]

so is like

where the horner thingy is

is the 18 supposed to be a -18

because thats where my confusion lies

cause if you have 18.(-1) - (-1)^2 + 19 you get -18 -1 +19 and not +18 -1 +19

[jolly notch]

$(x-a)(x-b) = x^2 - bx - ax + ab = x^2 - (a+b)x + ab$

[radiant hull]

Daddy_314

[jolly notch]

In your case
$-(x^2-18x-19)$

Factor $x^2-18x+19$
The product of the roots is -19 and their sum is 18

The only options are a = -1
And b = 19

So $x^2-18x+19 = (x-(-1))(x-19)$

Therefore $-(x^2-18x+19) = -(x+1)(x-19) = (x+1)(-x+19)$

[radiant hull]

Daddy_314

[jolly notch]

I think what is confusing you is the leading minus sign