The amount y of photosynthesis that takes place in a certain plant depends on the intensity x

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The amount y of photosynthesis that takes place in a certain plant depends on the intensity x of the light present according to

y = 120x2 - 20x3     for x ≥ 0

(a) Graph this function with a graphing calculator (Use y-min = -100 and y-max = 700.)

(b) The model is valid only when f (x) ≥ 0 (that is, on or above the x-axis). For what x-values is this true?

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