Question

x+y=8,x-y=10 find x^2+y^2 and xy

Answer 1

X²+Y²=82

X²+Y²=82 AND XY=-9

Step-by-step explanation:

X+Y=8. eq1

X-Y=10. eq2

SUBTRACT eq2 from eq 1

Hence

X+Y-(X-Y)=19

2X=18

X=9 and Y=-1

Now X²+Y²=(9)²+(-1)²=82

And XY=9x(-1)=-9