JEE Main & Advanced
JEE Main Paper Phase-I (Held on 09-1-2020 Evening)
question_answer
Let \[a-2b+c=1\]. If then [JEE MAIN Held on 09-01-2020 Evening]
A)\[f(50)=1\]
B)\[f(-50)=501\]
C)\[f(-50)=-1\]
D)\[f(50)=-501\]
Correct Answer:
A
Solution :
Operate \[{{R}_{1}}\to {{R}_{1}}+{{R}_{3}}-2{{R}_{2}}\] and using \[a-2b+c=1\] \[\Rightarrow \,\,\,f(x)=1\,\,\,\,\,\,\,\,\,\,\,\,\Rightarrow \,\,\,f(50)=1\]