1.

यदि `ab=21` और `((a+b)^(2))/((a-b)^(2))=25/4` हो तो `a^(2)+b^(2)+3ab` का मान क्या होगा?A. 115B. 121C. 125D. 127

Answer» Correct Answer - B
`((a+b)^(2))/((a-b)^(2))=25/4`
`(a+b)/(a-b)=5/2`
by C & D
`(a+b+a-b)/(a+b-a+b)=(5+2)/(5-2)`
`(2a)/(2b)=7/3`
`a/b=7/3`
Now, the value of
`implies a^(2)+b^(2)+3ab`
`= 7^(2)+3^(2)+3xx7xx3`
`=49+9+63=58+63`
`=121`


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