Find the interval(s) on which $f(x) = x^{2} - 6 x + 4$ is strictly increasing.

(-\infty, 3)

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(-3, \infty)

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(-\infty, -3)

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(3, \infty)

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Show the answer and explanation

CorrectNot quiteAnswer D

Correct answer: D

Worth noting

For $a > 0$ the parabola opens up, so it falls first and rises after $x = 3$ .

Ten questions from Increasing & Decreasing Functions, at your own pace.

Ten questions from Increasing & Decreasing Functions, at your own pace.

Find the interval(s) on which f(x)=x2−6x+4f(x) = x^{2} - 6 x + 4f(x)=x2−6x+4 is strictly increasing.