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Applications of differentiation
Direction of variation of a quadratic function
MCQ
Let f(x) = x² - 6x + 5, defined on R. We have f'(x) = 2x - 6. On what interval is f increasing?
Possible answers
]
−
∞
;
3
]
\left]-\infty \,;\, 3\right]
]
−
∞
;
3
]
[
3
;
+
∞
[
\left[3 \,;\, +\infty\right[
[
3
;
+
∞
[
All of
R
\mathbb{R}
R
[
0
;
3
]
[0 \,;\, 3]
[
0
;
3
]
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