Question

I dont understand how to solve this problem

Answer 1

Hope this one will help :)

thanks....

Answer 2

Answer:

1.-3xy-2$x^{2}$-13$y^2$

2.-16

Step-by-step explanation:

subtract :

-7 xy - 3$x^{2}$-4$y^2$

+4$x^{2}$  + $x^{2}$ -9$y^2$

                         

-3xy - 2$x^{2}$ -13$y^2$

2.  $a^2$-2ab+$b^2$ = $(a-b)^{2}$

    replace a=-3 and b=5

    $(a-b)^2$= $(-3-5)^2$

                = (-3*-3)- (5*5)

                = 9-25

                = -16