Q.

Statement I: If  fx=x2+bx+c and f2+t=f2t for all real numbers t, then  f1<f2<f4
Statement II: If fx=x2+bx+c  and f2+t=f2t for all real numbers t, then  f2<f1<f4
 

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a

Statement I is true, Statement II is false

b

Statement I is false, Statement II is false

c

Statement I is false, Statement II is true

d

Statement I is true, Statement II is true

answer is B.

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Detailed Solution

 fx=x2+bx+cf2+t=f2t
 f is symmetric about a line x=2
 b2=2b=4
 fx=x24x+c
Now, 3 graphs are possible.
 Question Image
In (1) and (2) ‘c’ is positive and in (3) ‘c’ is negative.
 f0=c
Let c is positive.
Now, f1=c3
 f2=c4
 f4=c
Say  c=3
then  f1=0;f2=1;f3=3f2<f1<f3
Again c is negative. Let  c=3
 f1=6;f2=7;f4=3
 f2<f1<f4B
Also,if c=0 the statement ‘2’ is true.
 

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