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March 24, 2017

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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 - ,

    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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