find the product (7x + 9y2) (3xy2) and evaluate when x=2,y=-1
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= (7x +9y²) (3xy²)
put x=2 y =-1
=[7(2) + 9 (-1)²] [3(2)(-1)²]
= 14 +9 ×6
= 14 + 54
= 68
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