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Question
Find the derivative of the following function (it is to be understood that a, b, c, d, p, q, r and s are fixed non-zero constants and m and n are integers):
`(px^2 +qx + r)/(ax +b)`
Solution
`d/dx((px^2 + qx + r)/(ax + b)) = ([d/dx (px^2 + qx + r)](ax + b) - (px^2 + qx + r)d/dx(ax + b))/(ax + b)^2`
= `((2px + q)(ax + b) - (px^2 + qx + r). a)/(ax + b)^2`
= `(2apx^2 + 2bpx + apx + bq - apx^2 - apx - ar)/(ax + b)^2`
= `(apx^2 + 2bpx + bq - ar)/(ax + b)^2`
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