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प्रश्न
Find the square of `2"m"^2-2/3"n"^2`
बेरीज
उत्तर
`2"m"^2-2/3"n"^2`
`(2"m"^2-2/3"n"^2)^2=(2"m"^2)^2+(2/3"n"^2)^2-2xx2"m"^2xx2/3"n"^2`
`=4"m"^4+4/9"n"^4-8/3"m"^2"n"^2`
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