college algebra
posted by Joe .
(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 
Reiny
(x+5y)(7x+3y)
= 7x^2 + 3xy + 35xy + 15y^2
= 7x^2 + 38xy + 15y^2
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