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Functions question

2017 · 8 Apr · Shift 1 · Q29
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  5. /2017 · 8 Apr · Shift 1 · Q29

Functions question

2017 · 8 Apr · Shift 1 · Q29

JEE MainMathematicsFunctionsMCQ+4 / −1
Let f(x) = 210.x + 1 and g(x)=310.x −-− 1. If (fog) (x) = x, then x is equal to :
  1. A
    310−1310−2−10{{{3^{10}} - 1} \over {{3^{10}} - {2^{ - 10}}}}310−2−10310−1​
  2. B
    210−1210−3−10{{{2^{10}} - 1} \over {{2^{10}} - {3^{ - 10}}}}210−3−10210−1​
  3. C
    1−3−10210−3−10{{1 - {3^{ - 10}}} \over {{2^{10}} - {3^{ - 10}}}}210−3−101−3−10​
  4. D
    1−2−10310−2−10{{1 - {2^{ - 10}}} \over {{3^{10}} - {2^{ - 10}}}}310−2−101−2−10​
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