MCQ
વિધેય $f(x) = 2{x^3} - 3{x^2} - 36x + 7$ એ. . . .અંતરાલમાં ઘટતું વિધેય છે .
- ✓$(-2, 3)$
- B$(2, 3)$
- C$(2,-3)$
- Dએકપણ નહીં.
$ \Rightarrow f'(x) = 6{x^2} - 6x - 36$ but for decreasing $f'(x) < 0$
==> ${x^2} - x - 6 < 0 \Rightarrow (x - 3)(x + 2) < 0$ ==> $ - 2 < x < 3$
Hence the required interval is $ (-2, 3).$
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