Question: 8) For the function f(x)=x+ 2x 23x 24x +136 . use secant slopes to verify that a local maximum or minimum occurs at the point

8) For the function f(x)=x"+ 2x 23x" 24x +136 . use secant slopes to verify that a local maximum or minimum occurs at the point where x = 3. State whether it 1s a maximum or a minimum that occurs at this point. (4 5 marks)
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