Question

İF X+Y=5 AND X-Y=5 THEN X^2+Y^2 =???

Answer 1

Answer:

X+Y=5-----(1)

X-Y=5-----(2)

-----+

2X=10

X=5

(1) X+Y=5

5+Y=5

Y=0

X^2+Y^2=5^2+0^2

25+0

25