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Find the approximate value of (82)^1/4.(a) 3.025(b) 3.05(c) 3.00925(d) 3.07825This question was posed to me in exam.This key question is from Derivatives Application topic in section Application of Derivatives of Mathematics – Class 12

Answer» RIGHT answer is (c) 3.00925

Easiest explanation: Let y=x^1/4. Let x=81 and Δx=1

Then, Δy=(x+Δx)^1/4-x^1/4

 Δy=82^1/4-81^1/4

82^1/4=Δy+3

dy is approximately equal to Δy is equal to

dy=\(\FRAC{dy}{DX}\)Δx

dy=\(\frac{1}{(4x^{3/4})}\).Δx

dy=\(\frac{1}{(4×81^{3/4})} (1)\)

dy=\(\frac{1}{(4×27)}\)=0.00925

∴ The APPROXIMATE VALUE of 82^1/4 is 3+0.00925=3.00925


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