Mathematics

Mathematics

Problem

Let s(x)=x2a(x)b(x)s(x)=x^{2}a(x)b(x), where aa and bb are differentiable functions. At x=1x=1 the following values are known: a(1)=2a(1)=2, a′(1)=−1a'(1)=-1, b(1)=3b(1)=3, and s′(1)=20s'(1)=20. Determine b′(1)b'(1).

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