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Answer it

Q.10. How much larger is $9{x}^{2}-8{y}^{2}than5{x}^{2}-3{y}^{2}$?

$(9{x}^{2}-8{y}^{2})-(5{x}^{2}-3{y}^{2})=(9-5){x}^{2}+(-8+3){y}^{2}\phantom{\rule{0ex}{0ex}}=4{x}^{2}-5{y}^{2}\phantom{\rule{0ex}{0ex}}Hence,9{x}^{2}-8{y}^{2}islargerthen5{x}^{2}-3{y}^{2}by4{x}^{2}-5{y}^{2}$

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