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    Solve 4^(x) − 3(2^(x + 1)) = 0

    QUESTION 5B SOLOMAN C CORE 2

    http://www.tomred.org/uploads/7/7/8/..._solomon_c.pdf

    Can someone show me step by step pleasE?
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    (Original post by Xx4L3x)
    Solve 4^(x) − 3(2^(x + 1)) = 0

    QUESTION 5B SOLOMAN C CORE 2

    http://www.tomred.org/uploads/7/7/8/..._solomon_c.pdf

    Can someone show me step by step pleasE?
    4^x - 3(2^{x+1}) = 0

    (2^2)^x - 3(2^x \times 2^1) = 0

    (2^x)^2 - 6(2^x) = 0

    Can you see what needs to be done here?
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    (Original post by justinawe)
    Have you already done S2? Or have you got it this Friday too? :holmes:
    I did it January, got 96/100 (Stupid definitions.)
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    (Original post by DJMayes)
    I did it January, got 96/100 (Stupid definitions.)
    Gotta make a mental note to learn some definitions before the exam

    So what have you got for maths, then? S3, S4, M4, M5, C4, FP2, FP3? And STEP, of course
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    (Original post by justinawe)
    Gotta make a mental note to learn some definitions before the exam

    So what have you got for maths, then? S3, S4, M4, M5, C4, FP2, FP3? And STEP, of course
    Yes, exactly those.

    (And G495 for Physics.)
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    (Original post by DJMayes)
    Yes, exactly those.

    (And G495 for Physics.)
    I was actually considering doing STEP I this time around, but it was already early March when I started thinking about it, and I wasn't too sure if it was too late to start STEP prep and still come out with a good score.
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    (Original post by justinawe)
    4^x - 3(2^{x+1}) = 0

    (2^2)^x - 3(2^x \times 2^1) = 0

    (2^x)^2 - 6(2^x) = 0

    Can you see what needs to be done here?
    I don't understand why you have swapped the x and the 2 on the 2nd and 3rd line in the first bracket?
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    (Original post by Xx4L3x)
    I don't understand why you have swapped the x and the 2 on the 2nd and 3rd line in the first bracket?
    (a^b)^c = (a^c)^b

    One of the basic rules of indices, I suggest you learn these.
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    (Original post by justinawe)
    (a^b)^c = (a^c)^b

    One of the basic rules of indices, I suggest you learn these.
    Ok why are you doing that though? What needs to be done for the logs (i dont really know )))
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    Officially finished my AS Physics course, now it's maths all day!
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    (Original post by justinawe)
    I was actually considering doing STEP I this time around, but it was already early March when I started thinking about it, and I wasn't too sure if it was too late to start STEP prep and still come out with a good score.
    I don't think it's necessary. Besides, aren't you already sitting the likes of FP2 in year 12?
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    (Original post by Boy_wonder_95)
    Officially finished my AS Physics course, now it's maths all day!
    Finished mine as soon as I was done with the practical I've got unit 4 Physics in June, though! :eek:
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    (Original post by DJMayes)
    I don't think it's necessary. Besides, aren't you already sitting the likes of FP2 in year 12?
    and FP3

    Yeah, I didn't think it necessary either, I just thought having to do STEP prep might force me to get off my lazy arse
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    (Original post by Xx4L3x)
    Ok why are you doing that though? What needs to be done for the logs (i dont really know )))
    you need to make it a quadratic so you can easily get x values. You log it later.
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    (Original post by Xx4L3x)
    Ok why are you doing that though? What needs to be done for the logs (i dont really know )))
    Can you find a common factor of (2^x)^2 - 6(2^x) ?
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    (Original post by justinawe)
    Finished mine as soon as I was done with the practical I've got unit 4 Physics in June, though! :eek:
    Yh but aren't you pretty much doing all your A2s this summer? Since you have a shorter year
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    (Original post by Boy_wonder_95)
    Yh but aren't you pretty much doing all your A2s this summer? Since you have a shorter year
    Pretty much

    Next year (aside from maths), I'll have:

    Econ 3
    Physics 5 + practical

    that's about it
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    (Original post by justinawe)
    Pretty much

    Next year (aside from maths), I'll have:

    Econ 3
    Physics 5 + practical

    that's about it
    Meh, I think I'd rather have a balanced two years. All that pressure on the first year is a bit unnecessary
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    Only 2 more days to go until history is out of my life, then its just maths and econ from here :cool:
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    (Original post by Boy_wonder_95)
    Meh, I think I'd rather have a balanced two years. All that pressure on the first year is a bit unnecessary
    My A2 has involved so much more than AS. At AS, I did four AS subjects (Maths, Further, Physics, Business) and that was it. At A2, I've done 3 A2 levels, one entire A Level, plus a ton of work for STEP. I'm going to be lost when my final exam is over, as I'll suddenly have absolutely nothing to do.
 
 
 
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