Sathish purchased ( 4x – 2y) number of wrist watches to gift their family
members. The cost of each watch is Rs. (3x + 8y). Find the total amount paid by
sathish.
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Answer:
(4x-2y) (3x-8y)
=4x(3x-8y)-2y(3x-8y)
12x^2-24xy-6xy+16y^2
12x^2 -30xy +16y^2
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