(2x-1)/(3+x)=(2x+6-7)/(3+x)=2-7/(3+x)
f'(x)=7/(3+x)^2
f'(2)=7/25
f'(x)=(2*(3+x)-(2x-1))/(3+x)^2=(6+2x-2x+1)/(3+x)^2=7/(3+x)^2
f'(2)=7/(3+2)^2=7/5^2=7/25=0.28
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(2x-1)/(3+x)=(2x+6-7)/(3+x)=2-7/(3+x)
f'(x)=7/(3+x)^2
f'(2)=7/25
f'(x)=(2*(3+x)-(2x-1))/(3+x)^2=(6+2x-2x+1)/(3+x)^2=7/(3+x)^2
f'(2)=7/(3+2)^2=7/5^2=7/25=0.28