Find f(-4),f(-3.1),f(1.2)and f (2.8)for f(x)=x

The answer is f(-4) = -4 ,f(-3.1) = -3.1 ,  f(1.2) = 1.2 , f(2.8) = 2.8

Step-by-step explanation:

   We have to find out f(-4) , f(-3.1) , f(1.2) , f(2.8)

    For the condition f(x) = x

    This means that whatever we give input to the function the value to the

     function is equal to the value input this means that

    f (input) = output

    Here output = input

    f ( input ) = input

    ∵ f(-4) = -4

       f(-3.1) = -3.1

       f(1.2) = 1.2

       f(2.8) = 2.8

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)