Question

Solve this problem if x=-7,y=3,find x+y, xy and x^2+y^2+2xy

Answer 1

Answer:

x+y= -4 , xy= -21 , x^2+y^2+2xy =16

Answer 2

Answer:

-7+3= -4 (x+y)

-7×3= -21 (xy)

-7²+3²+2×-7×3= -49+9+42 = -2 (x²+y²+2xy)