math, answer please!

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I don't understand how you do these 2 problems.

(p-7)(p+8)
& (-7+p)(8+p)

  • math, answer please! -

    if you have to find P then set them equal to zero eg

    p-7=0
    p=7

    OR foil it out eg
    (p-7)(p+8)=P2+p-56

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