MCQ
$f(x) = 2x^3 - 21x^2 + 36x + 7 $ ને $X=$ ........ આગળ મહત્તમ છે.
- A$ 2$
- ✓$ 1$
- C$ 6$
- D$ 3$
$f'(x) = 12x - 42$
હવે $f'(x) = 0 ==> 6(x^2 - 7x + 6) = 0 ==> x = 1, 6$
પણ $f'' (1) = 12 - 42 = -30 < 0$
$ x = 1$ આગળ $f(x) $ મહત્તમ છે.
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