MHT CET · Maths · Application of Derivatives
The approximate value of \((3.978)^{\frac{3}{2}}\) is
- A 7.934
- B 8.934
- C 7.022
- D \(8.866^{\circ}\)
Answer & Solution
Correct Answer
(A) 7.934
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \text { Let } \mathrm{f}(x)=x^{\frac{3}{2}} \\ & \therefore \quad \mathrm{f}^{\prime}(x)=\frac{3}{2} x^{\frac{1}{2}} \\ & \text { Here, } \mathrm{a}=4, \mathrm{~h}=-0.022 \\ & \mathrm{f}(3.978)=(4)^{\frac{3}{2}}=-0.022 \times \frac{3}{2} \times(4)^{\frac{1}{2}} \\ &=8-0.033 \times 2 \\ &=8-0.066=7.934\end{aligned}\)
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