Question: The expression u(x) is an integrating factor for y' + P(x)y = Q(x). Which of the following is equal to u'(x)? Verify your answer. (a)

The expression u(x) is an integrating factor for y' + P(x)y = Q(x). Which of the following is equal to u'(x)? Verify your answer.
(a) P(x)u(x)

(b) P'(x)u(x)

(c) Q(x)u(x)

(d) Q'(x)u(x)

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