Question

Solve x(3xy + 4x-7y) – 7x² + 4y2​

Answer 1

The required difference =(7x

2

−2xy−4y

2

)−(5x

2

−3xy+y

2

)

=7x

2

−2xy−4y

2

−5x

2

+3xy−y

2

Rearranging and collecting like terms

=(7x

2

−5x

2

)+(−4y

2

−y

2

)+(−2xy+3xy)

=2x

2

−5y

2

+xy