Question

SECTION—(B)
2 marks each
If x + y = 8 and xy =5 find the value of x2 + y2.

Answer 1

Step-by-step explanation:

x+y=8

square both sides

therefore

x2+y2+2xy=64

substitute xy=5

in the equation

therefore x2+y2=64-10

thereforex2+y2=54

Answer 2

Answer:

Step-by-step explanation:

take x=8-y

and y=5/x

and substitute it in x²+y²