**Guide :High School **

# Find f(a), f(a+h) and the difference quotient (f(a+h)-f(a))/ h, where hod want equal 0.

Find f(a), f(a+h) and the difference quotient (f(a+h)-f(a))/ h, where hod want equal 0. F(x)= 2x/ x-1**First. Calculate f'(x) = (2x/x-1)' = (-2)/; when x is not 1;Second.Calculate f'(0) = -2 => the difference quotient (f(a+h)-f(a))/ h, where hod want equal 0 is -2;Third.f(a) = 2a/a-1; f(a+h) = (2a+2h)/(a+h-1);**...