Find and simplify the difference quotient (f(x+h)-f(x))/(h),h!=0 for the given function. f(x)=x²+9x+2
1) (2x²+2x+2xH⁺h²+H⁺4)/(h)
2) 2x+H⁺9
3) 2x+H⁺2
4) 1