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Q.

The function f satisfies the functional equation 3 fx+2fx+59x-1=10x+30 for all real x≠1 The value f7 is

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a

8

b

4

c

-8

d

11

answer is B.

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Detailed Solution

3fx+2fx+59x-1=10x+30For  x=7,3f7+2f11=70+30=100For  x=11,3f11+2f7=140.          f7-20=f11-220=-19-4    or   f7=4
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