21898
Unique Id: 18582
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DIRECTIONS
for the question:
Solve the following question and mark the best possible option.
If x + y = 11 and xy = 15, then the value of ( x
2
+ y
2
) is
A)
85
B)
75
C)
91
D)
101
E)
None of these
C
We have x + y = 11, xy = 15. Now we have (x + y)
2
= x
2
+ y
2
+ 2xy
=> 121 = x
2
+ y
2
+ 2 × 15 ⇒ x
2
+ y
2
= 91.Hence option C.
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