1.

यदि `a+b-5` और `a-b-3`, हो तो `(a^(2)+b^(2))` का मान बताइए?A. 17B. 18C. 19D. 20

Answer» Correct Answer - A
`a+b=5`
`a^(2)+b^(2)+2ab=25` …………..i
`a-b=3`
`a^(2)+b^(2)-2ab=9`………….ii
From equation i and ii
`2(a^(2)+b^(2))=34`
`a^(2)+b^(2)=17`


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