algebra 2

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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 -

    x^2 -19x + 72
    Prime
    x^2 -25x +48
    prime

    Or you can use quadratic formula

    ok
    (x -6)(x+15)

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