Question 30: Given the function \(y = f(x) = 2{x^3} + 6{x^2} + 6x – 2017\). Which statement below is incorrect?

\(\begin{array}{l} D = \mathbb{R} \\ y = f(x) = 2{x^3} + 6{x^2} + 6x – 2017\\ y’ = 6{ x^2} + 12x + 6\\ y’ = 0 \Leftrightarrow 6{x^2} + 12x + 6 = 0 \Leftrightarrow x = – 1 \end{array}\)

Where x=-1 is an even multiple solution

Variation table

Leaning on the variation table, the wrong answer is a BEVER answer

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