first one because you’re multiplying everything inside the parenthesis by 3
The answer is 88 hope that helped
At x = -4 and -8
Take the derivative of the given equation to find rate of change of the graph.
f'(x) = 6x^2 + 72x + 192
At a horizontal tangent, f'(x) = 0, so set the equation equal to 0 and solve. Eventually you get x = -4 and -8
Y=6 In this equation you also use combine like terms .
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