Posted by **Alyssa** on Sunday, November 10, 2013 at 9:05pm.

So I am doing my algebra home work and I get stuck on these three problems.

x^2-19x+72 from there idk what to do because nothing multiplies up to 72 and adds up to -19.

Same for this one.

x^2-25x+48

And

x^2+9-90

(X+15) (x-6)

- algebra 2 -
**Reiny**, Sunday, November 10, 2013 at 10:20pm
I am assuming you are factoring ?

for x^2 - 19x + 72 there are no factors with rational numbers

(I found the discriminant b^2 - 4ac to be 649, which is not a perfect square, thus no factors)

x^2 - 25x - 90

same thing, b^2-4ac = 985 , no factors

I assume a typo in the 3rd and you meant:

x^2 + 9x - 90

which does factor to (x+15)(x-6)

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