Question: without plotting, can you guess an approximate value of z at which y = (x - 1)(x-2) is minimum. (You may plot y =

without plotting, can you guess an approximate value of z at which

without plotting, can you guess an approximate value of z at which y = (x - 1)(x-2) is minimum. (You may plot y = r - 1 and y=x-2 separately if you want.) Give a reason why? Now check your guess by plotting the function. Can you now guess what value of z minimizes y = (x+2)(x - 1)(x - 2)?

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