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posted by Joe on Saturday, September 29, 2012 at 8:39pm.

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

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

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