Question

pls answer this sooon​

Answer 1

Answer:

5x^2+2xy+5y^2

Step-by-step explanation:

= {(5x^2-3xy-y^2)+(x^2+2xy-2y^2)} - {(7x^2-4y^2)+(4x^2+3xy-4y^2}

= {5x^2-3xy-y^2+x^2+2xy-2y^2} - {7x^2-4y^2+4x^2+3xy-4y^2}

= {6x^2-xy-3y^2} - {11x^2-8y^2+3xy}

= 6x^2-xy-3y^2-11x^2+8y^2+3xy

=-5x^2+2xy+5y^2