Q.

If x  is real, then the expression x2+34x71x2+2x7  can have no value between

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a

3 and 7

b

4 and 8

c

5 and 9

d

6 and 10

answer is C.

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Detailed Solution

The given expression is x2+34x71x2+2x7

Let x2+34x71x2+2x7=m ,

x2+34x71m(x2+2x7)=0

(m1)x2+2(m17)x+(717m)=0

Since x  is real,     Discriminant (b24ac)0

4(m17)24(m1)(717m)0

 m214m+450    (m5)(m9)0

m5  or m9

Hence m  can have no value between 5 or 9.

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If x  is real, then the expression x2+34x−71x2+2x−7  can have no value between