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f/math

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the common ratio of a g.p is 2.if the 5th term is greater than the first term by 45, find the 5tth term

  • f/math - ,

    Is g.p. supposed to mean geometric progression? You should not assume that we know that.

    The fifth term will be 2^3 = 8 times the second term

    a5 = 8 a2
    a5 = a2 + 45
    0 = 7 a2 -45
    a2 = 45/7
    a3 = 90/7
    a4 = 180/7
    a5 = 360/7

    Check: a5 - a2 = 315/7 = 45

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