Find the differential dy of the given function. (Use "dx" for dx.)

Question

y=(x+1)/4x-9

Marked as incorrect: [(1)-4/(4x-9)² ] * dx

Answer 1

Assume you are using the quotient rule resulting in something like this:

(4x-9)(1) - (x+1)(4)

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(4x - 9)²

That numerator simplifies to: 4x - 9 - 4x - 4 = -13.

Try -13 in the numerator and see how that goes.