Question
Write the solution set of the equation x2 + x – 2 = 0 in roster form.
(x – 1) (x + 2) = 0, that is x = 1, – 2
Therefore, the solution set of the given equation can be written in roster form as {1, – 2}.
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If a and b are coefficients of xn in the expansions of $(1+\text{x})^{2\text{n}}$ and $(1+\text{x})^{2\text{n}-1}$ respectively, then write the relation between a and b.