Calculate the difference quotients for f(x)=9+2x−x22 f ( x ) = 9 + 2 x − x 2 2 using h=0.1 h = 0.1 , 0.01 0.01 , and 0.001 0.001 . Use the results to approximate the slope of the tangent line to the graph of f(x) f ( x ) at the point (4,9) ( 4 , 9 ) . If necessary, round the difference quotients to no less than six decimal places and round your final answer to the nearest integer.