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    given that: g(y)=2(3^3y)-5(3^2y)-9(3^y)+18

    find values of y that satisfy g(y)=0 giving answers to 2 decimal places where appropriate
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    (Original post by olololololololol)
    given that: g(y)=2(3^3y)-5(3^2y)-9(3^y)+18

    find values of y that satisfy g(y)=0 giving answers to 2 decimal places where appropriate
    What have you tried so far?

    If you show us your workings we'll be able to point you in the right direction :yep:
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    (Original post by olololololololol)
    given that: g(y)=2(3^3y)-5(3^2y)-9(3^y)+18

    find values of y that satisfy g(y)=0 giving answers to 2 decimal places where appropriate
    Have you tried letting  3^y equal some variable, say  x , for example?

    You could use this and then solve to find the values of  x , and then go on to solve for  y .
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    I believe this is from the June 2013 C2 paper?

    If you notice, it is a slightly altered version of the equation you factorised in part b. Therefore, find the solutions for x from part b and then set 3^y equal to each of these values and you will get your answer!

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