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# C3 differentiation help watch

1. Need help on this question.
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2. My working out so far. Need help from how to get from penultimate step to final answer.
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3. This is the official answer for this question. I have the working out correct but i dont understand how to get to the final answer.
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4. Use Product Rule, (fg)' = fg' +gf'
The right one is a bit more troublesome, use chain rule once
5. (Original post by GulfstG650ER)
Use Product Rule, (fg)' = fg' +gf'
The right one is a bit more troublesome, use chain rule once
6. in the second bottom line, you mixed up the polynomials.
it should be -15x^2 (5x-1)^(-2) divided by ((3x)(5x-1)^(-2)) plus 2(5x-1)
7. It is much easier to use the quotient rule for this question.
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