Question

Evaluate :

a) x2+y2 if x+y=8,xy=15 b)abc if ab+3c=12,ab-3c=4 c) x+y if x -y=17, xy= -3 d) x+1/x if x2+1/x2 =14​

Answer 1

Answer:

Step-by-step explanation:

a) x2 + y2

   = (x+y)2 - 2xy

   = (8)2 - 2 x 15  [ since, x+y = 8, xy=15]

   = 64 - 30

   = 34

 

Answer 2

Answer:

a)34

b)32/3

c)277

d)4

Step-by-step explanation:

I have given explanation in pictures uploaded with the answer. It can make you understand better.

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