Please give solution of the following :-

Answer :  (i)  Given : f(x)= -2x + 5

To find  : The value of 2f(x)+f(-x)

 

Now ,

 f(x)= -2x + 5..................(1)

Replacing x by -x , we get ,

 f(-x)= 2x + 5 .................(2)

 

Now as asked by the question 

= 2 f(x) - f(-x) 

= 2 ( -2x + 5) - (2x+5)        {using (1) and (2) }

= -4x + 10 - 2x -5

= - 6x  + 5 Answer 

 

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