Answer 1.1:1
From Förberedande kurs i matematik 2
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| a) | \displaystyle f^{\,\prime}(-4)>0\quad\text{and}\quad f^{\,\prime}(1)<0 |
| b) | \displaystyle x=-3 and \displaystyle x=2 |
| c) | \displaystyle -3< x < 2 |
