Question

If x+y =5 and xy=4 Then find the value of x cube + y cube​

Answer 1

1. xy=4
2. and x+y =5
3. then x=4andy=1
4. x cube +y cube= 64+1=65

Answer 2

Answer:

given

x+y =5

xy =4

use (x+y)³ = x³ + y³ +3xy(x+y)

put the given values in it....

we get

5³ = x³ + y³ +3(4)(5)

x³ + y³ = 125 - 60

x³ +y³ = 65

hope this will help you