Question

(13ײ-12y²)+(6ײ-8y²​

Answer 1

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

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

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

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

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

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