Question

3xy-x² + 7y² -2 from 6xy - 4x² -y² +5​

Answer 1

${\huge{\underline{\underline{\rm{Answer :}}}}}$

3xy - x² + 7y² - 2 from 6xy - 4x² - y² + 5

=> 3xy - x² + 7y² - 2 - ( 6xy + 4x² + y² - 5 )

• [ We have to change signs in bracket " + inverts - / - inverts + " ]

=> 3xy - x² + 7y² - 2 - 6xy + 4x² + y² - 5

• [ By checking like terms ]

=> ( 3xy + -6xy ) + ( -x² + 4x² )+ ( 7y² + y² )+ ( -2 + -5 )

• => -5x² - 3xy + 8y² - 7