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MHT CET202124 Sep 2021Evening ShiftMathematicsFunctionsActual

If f ( x )=2 x +5 x , where x is fractional part function, then f(-1.4) is

Options

  1. A8.2
  2. B-8.2
  3. C-5.8
  4. D-5

Correct answer

C. -5.8

Step-by-step solution

We know that x =[ x ]+ x When x =-1.4 , we get [ x ]=-2 and x =0.6 We have f(x)=2 x +5 x f (-1.4)=2(0.6)+5(-1.4)=-7+1.2=-5.8

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