Question

If x - y =13&xy=28,thenfindx×x + y×y

Answer 1

we know that (a-b)^2=a^2+b^2 &2ab
(x-y)^2=x^2+ y^2 -2xy
(13)^2= x^2 +,y^2-2(28)
169 = x^2 + y^2 -56
x^2+y^2 = 169+56
x^2 + y^2 =225
I hope it will be helpful.
with best regards
MERRY CHRISTMAS ☃☃☃☃☃☃