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Question
Evaluate : `(7"x"+2/3"y")(7"x"-2/3"y")`
Sum
Solution
`(7"x"+2/3"y")(7"x"-2/3"y")`
`=7"x"(7"x"-2/3"y")+2/3"y"(7"x"-2/3"y")`
`=49"x"^2-14/3"xy"+14/3"xy"-4/9"y"^`
`=49"x"^2-4/9"y"^2`
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Product of Sum and Difference of Two Terms
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