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Math Help - Find derivative

  1. #1
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    Find derivative

    so i did these questions are they right ? the working and all ??


    Find the dervative


    θ= 3r+2/2r+3

    dθ/dr= d/dr (3r+2)(2r+3)-(3r+2)d/dr(2r+3)/ (2r+3)^2

    dθ/dr= 3(2r+3)-2(3r+2)/(2r+3)^2

    dθ/dr= 6r +9-6r-4/ (2r+3)^2

    dθ/dr= 5/(2r+3)^2



    Find the derivative

    y= x^2 +2x -3
    y= (x+Δx)^2+2(x+Δx)-3-(x^2+2x-3)
    y= x^2 +2xΔx+(Δx)^2+2x+2Δx-3-x^2-2x+3
    =2xΔx+(Δx)^2+2Δx
    =(2x+2)Δx
    =2x+2 or 2(x+1)

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  2. #2
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    Re: Find derivative

    Both are correct.
    Thanks from arsenal12345
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