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    Name:  20160305_214931.jpg
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    I'm having some trouble with the question in the picture. I used some trial and error to find an answer, but I'm sure there must be another way of doing it. Any ideas? Thanks.
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    You have two points, let's use the first one: 5 = pq and 320 = pq^4 = pqq^3 = 5q^3 \Rightarrow q^3 = \cdots.
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    (Original post by Zacken)
    You have two points, let's use the first one: 5 = pq and 320 = pq^4 = pqq^3 = 5q^3 \Rightarrow q^3 = \cdots.
    Thanks! I've worked it out now using that to form the equation 320/q^3=5 and solving it.
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    (Original post by Lelanor)
    Thanks! I've worked it out now using that to form the equation 320/q^3=5.
    Do you mean \displaystyle q^3 = \frac{320}{5} = 64 = 4^3?
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    (Original post by Zacken)
    Do you mean \displaystyle q^3 = \frac{320}{5} = 64 = 4^3?
    Well, I did this:
    320/q^3 = 5
    320 = 5q^3
    q^3 = 64
    q = 4
    But that's pretty much the same thing.
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    (Original post by Lelanor)
    Well, I did this:
    320/q^3 = 5
    320 = 5q^3
    q^3 = 64
    q = 4
    But that's pretty much the same thing.
    Fair enough. You cool with the method?
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    (Original post by Zacken)
    Fair enough. You cool with the method?
    Yep, your first post nudged me in the right direction. I realised I'd have to form some kind of equation(s) but I just couldn't work out what, so thanks
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    (Original post by Lelanor)
    Yep, your first post nudged me in the right direction. I realised I'd have to form some kind of equation(s) but I just couldn't work out what, so thanks
    Awesome, glad I helped.
 
 
 
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