1.

(13ײ-12y²)+(6ײ-8y²​

Answer»

\huge{ \sf{ \bf{ \underline{ \underline{question}}}}}

\implies \: (13 {x}^{2} - 12 {y}^{2} ) + (6 {x}^{2} - 8 {y}^{2} )

\huge{ \bf{ \underline{ \underline{method}}}}

(13 {x}^{2} - 12 {y}^{2} ) + (6 {x}^{2} - 8 {y}^{2} ) \\ \implies \: 13 {x}^{2} - 12 {y}^{2} + 6 {x}^{2} - 8 {y}^{2} \\ \implies \: (13 {x}^{2} + 6 {x}^{2} )( - 12 {y}^{2} - 8 {y}^{2} ) \\ \implies \: 19 {x}^{2} - 12 {y}^{2} - 8 {y}^{2} \\ \implies \: 19 {x}^{2} - 20 {y}^{2}

\huge{ \bf{ \green{ \underline{ \underline{hence \: verified}}}}}

19 {x}^{2} - 20 {y}^{2}


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