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3.3.7 Sequences and series (A-level only)

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Question 6

A chemical engineer is modeling the yield, YYY, of a reaction as a function of the catalyst concentration, ccc. The relationship is given by the formula:

Y(c)=1+6c23∣c∣<16 Y(c) = \sqrt[3]{1 + 6c^2} \quad \quad |c| < \frac{1}{\sqrt{6}} Y(c)=31+6c2​∣c∣<6​1​
a.

Find, in ascending powers of ccc, the first three non-zero terms of the binomial series expansion of Y(c)Y(c)Y(c), giving each coefficient as a simplified fraction.

[4]
b.

Use the expansion from part (a) with c=13c = \frac{1}{3}c=31​ to find a rational approximation to k⋅53k \cdot \sqrt[3]{5}k⋅35​, where kkk is a constant you must determine.

[3]

3.3.7 Sequences and series (A-level only) Questions

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