a. Show that the expansion of q(x) in ascending powers of x can be approximated to 10 − 2x + Bx² + Cx³ where B and C are constants to be found. 

b. Find the percentage error made in using the series expansion in part b to estimate the value of q(0.1). Give your answer to 2 significant figures.

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q(x) = 9x² + 26x + 20 ~, [x] <1 (1 + x)(2 + x)