NDA Math Miscellaneous

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Question : 7 of 24
 
Marks: +1, -0
Consider the following expressions:
1. x+x2−‌‌
1
x

2.√ax2+bx+x−c+‌‌
d
c
−‌‌
e
x2

3. 3x2−5x+ab
4. ‌‌
2
x2−ax+b3

5. ‌‌
1
x
−‌‌
2
x+5

Which of the above are rational expressions?
[NDA II 2018]
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