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C1 - Indices Question watch

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    Just got a C1 question I couldn't do....



    Please show all working step by step Thanks
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    Take (x+7)^0.5 as a common factor.
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    Got it, Thanks!
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    (Original post by shift3)
    Take (x+7)^0.5 as a common factor.
    if i do that then i get (x+7)^0.5 (3 - 2/3(x+7)^3)

    where do i go from there?
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    You mean (x+7) not (x+7)^3!

    remember that x^(3/2) = x^(1 + 1/2) = x times x^(1/2)

    Davros
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    (Original post by davros)
    You mean (x+7) not (x+7)^3!

    remember that x^(3/2) = x^(1 + 1/2) = x times x^(1/2)

    Davros
    so you get

    (x+7)^0.5 (3-2/3(x+7)) ?
    how do u simplify that?
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    There doesn't seem to be a lot you can do except writing

    3 - 2/3(x+7) = (1/3)(9 - 2x -14) = -(1/3)(2x+5)

    Davros
 
 
 
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