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math

posted by on .

I've worked these problems but I was just wondering if someone could check over them to see if they're correct...if not please help!

(u-2)(u+7)
my answer: 7u^2-49u

(5t-4)^2
my answer: 25t^2-40+16

Thank you :)

  • math - ,

    hmm, well use either FOIL or the distributive property. I will use distributive property:
    (u-2)(u+7)
    my answer: 7u^2-49u
    -----------------------
    u(u+7) -2(u+7)
    u^2 + 7u - 2u - 14
    =
    u^2 + 5 u - 14
    ===============================

  • math - ,

    25t^2-40+16
    You forgot a t
    25t^2-40t+16

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