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college algebra

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(x+5y)(7x+3y)How do I solve this. I know I have to somehow combine the x and y but can't remember.

  • college algebra - ,

    (x+5y)(7x+3y)
    = 7x^2 + 3xy + 35xy + 15y^2
    = 7x^2 + 38xy + 15y^2

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