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asked in Calculus | 105 views
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A) Increasing??
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The stationary point is imaginary which is outside the function domain. So it means there is no stationary point. Answer should be A. Please post the answer.
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Yes it is A. Can you please elaborate a little more why A is the ans.

$\frac{\mathrm{d} (x^3+bx^2+cx+d)}{\mathrm{d} x}= (3x^2+2bx+c)$

$x=\frac{\mathrm{b^{2}\pm \sqrt{b^2-4c}} }{\mathrm{2} }$

$b^{2}-4c$<0     (0 <$b^{2}$< c)

$(3x^2+2bx+c)>0$ Hence  Increasing

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