Question

$\: x - y = 2 \\ \frac{1}{x + y} = \frac{2}{5}\ \\ \ solve \: this$
solve it immediately​

Answer 1

Answer:

Given x+y=2 and  

x

1

​

+  

y

1

​

=2

Then  

x

1

​

+  

y

1

​

=2

⇒  

xy

x+y

​

=2

⇒  

xy

2

​

=2

⇒xy=1

We know that  

X  

3

+y  

3

=(x+y)  

3

−3xy(x+y)⇒x  

3

+y  

3

=(2)  

3

−3(1)(2)=8−6=2

Step-by-step explanation: