exam Maths Puzzle Numerical Ability

For the function f(x)=x^2-8, construct and simplify the difference
quotient f(h+h)-f(x)/h
The difference quotient is=

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How do you test if something is a function on a graph? ......I remember my teacher saying something about using a pencil and lying it down on the graph, or something like that...please help!!!-I have a final TOMMMORROW!!! A cylinder with a height of 15 and a diameter of 20 is placed inside a 20 cm cube. What percent of the volume of the cube is not taken up by the cylinder?