Question

If x²+y²=4 & x³+y³=8, prove that x+y=2

Answer 1

Answer:

x = 2, y = 0

or

x = 0, y = 2...........

Answer 2

Answer:

x²+y²=4(given)

(x+y)²=2²

x+y=2

then

x³+y³=8(given)

(x+y)³=2³

x+y=2

so,

we verified that x+y=2