12. Find the product of each of the following:
(?) (3x + 5y + 2) (3x + 5y + 6)
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Answer:
9x²+15xy+6x+15xy+25y²+30y+6x+10y+12=
9x²+30xy+40y+12x+40
-------> 9x²+ 12x+ 30xy+40y+40
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