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Let f ( x ) = a x ^2 + b x + c 

  where  a , b , c  are rational and f : Z \rightarrow Z  ,  where Z is the set of integers. Then  a + b  is :

Option: 1

a negative integer 


Option: 2

an integer 


Option: 3

non integral rational  number 


Option: 4

none 


Answers (1)

best_answer

 

FUNCTIONS -

A relation f from a set A to a set B is said to be a function if every element of set A has one and only one image in set B.

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f (x) = a x^2 + bx + c \\\\

f(0) = c \\\ \Rightarrow c \in I \\\ f ( 1 ) = a+ b+ c \\\ (a+b+c)\in I \\\ (a+b) \in I

Posted by

seema garhwal

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