-5 -4 -3 -2 15 -30- -45 -60- -75 -90 -105- -120- -135- J 2 For the above quartic polynomial f(x): down. = TA 2 +0.5x³-15x², identify the interval on which f is concave

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A: a.

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A: Hence the required answer is given belowExplanation:Step 1: Step 2: Step 3: Step 4:

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A: Let's find.

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