solve the following sum
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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