Question

solve the following sum​

Answer 1

Answer:

square root of 79,169

Step-by-step explanation:

Given,x+y=8,xy=15/4

x-y=square root of (x+y)2-4xy

=square root of (8)square+4(15/4)

=square root of (64+15)

=square root of 79

ii)3(x2+y2)

3((x+y)2-2xy))

3((8)2-2(15/4))

3(64-15/2)

3(64(2)-15/2)

3(128-15/2)

3(113/2)

339/2

169.5