The price of one box is (a-7)
Rs. What is the total cost of (a+7)
boxes?
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Answer:
(a^2-7^2)
(a^2-49)
Step-by-step explanation:
total cost = price×quantity
=(a-7)×(a+7)
=a^2-7a+7a-7^2
=(a^2-49) Ans.
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