Assuming x to be so small that x^2 and higher | vedclass

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Question

(D) Given expression: $\frac{(1-x)^{1/3}+(1-5x)^2}{(16-x)^{1/4}}$$= \frac{1}{2} (1-x)^{1/3} (1-\frac{x}{16})^{-1/4} + \frac{1}{2} (1-5x)^2 (1-\frac{x}

Vedclass · Accepted Answer

$-\frac{989}{192}$

Vedclass · Answer

(D) Given expression: $\frac{(1-x)^{1/3}+(1-5x)^2}{(16-x)^{1/4}}$$= \frac{1}{2} (1-x)^{1/3} (1-\frac{x}{16})^{-1/4} + \frac{1}{2} (1-5x)^2 (1-\frac{x}{16})^{-1/4}$Using binomial expansion $(1+z)^n \approx 1+nz$ for small $z$:$= \frac{1}{2} (1-\frac{1}{3}x)(1+\frac{x}{64}) + \frac{1}{2} (1-10x)(1+\frac{x}{64})$$= \frac{1}{2} [ (1 - \frac{1}{3}x + \frac{x}{64}) + (1 - 10x + \frac{x}{64}) ]$$= \frac{1}{2} [ 2 - x(\frac{1}{3} + 10 - \frac{2}{64}) ]$$= 1 - \frac{x}{2} (\frac{1}{3} + 10 - \frac{1}{32})$$= 1 - \frac{x}{2} (\frac{32 + 960 - 3}{96}) = 1 - \frac{989}{192}x$Therefore,the coefficient of $x$ is $-\frac{989}{192}$.

Assuming $x$ to be so small that $x^2$ and higher powers of $x$ can be neglected,the coefficient of $x$ in $\frac{(1-x)^{1/3}+(1-5x)^2}{(16-x)^{1/4}}$ is equal to

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