Lösung 1.1:1c

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For x-values between -3 and 2, the graph of the function has a tangent which slopes downwards, i.e. negative derivative.

[Image]

The graph of f(x) has a tangent with negative
slope if -3 < x < 2.
Von „http://wiki.math.se/wikis/2009/bridgecourse2-TU-Berlin/index.php/L%C3%B6sung_1.1:1c“