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Increasing and Decreasing Functions — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSIncreasing and Decreasing Functions1 Mark
MCQ
The function $f(x) = x^9+ 3x^7 + 64$ is increasing on:
  • ✓
    $\text{R}$
  • B
    $(-\infty,0)$
  • C
    $(0,\infty)$
  • D
    $\text{R}_0$
✓

Answer

Correct option: A.
$\text{R}$

$\text{f}(\text{x})=\text{x}^9+3\text{x}^7+64$
$\text{f}'(\text{x})=9\text{x}^8+21\text{x}^6>0,\forall\ \text{x}\in\text{R}$
So, $f(x)$ is increasing on $R.$

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