Pre-Cal(Please help)

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1) Write the first five temrs of the geometric sequence

a1 = 2 r=sqrt3

I know the first term is 2 but the sqrt 3 threw me off so I do not know how to find the next numbers.

2) Find the nth term of the geometric sequence.

a2 = 3 a5 = 3/64 n=1

I know the formula is a1^r n-1 but I do not know how to find a1.

  • Pre-Cal(Please help) -

    Answered Already

  • Pre-Cal(Please help) -

    2
    2 sqrt 3
    2*3 = 6
    6 sqrt 3
    6*3 = 18
    18 sqrt 3
    18*3 = 54 etc

  • Pre-Cal(Please help) -

    a1
    a1 r = 3
    a1 r^2
    a1 r^3
    a1 r^4 = 3/64

    so
    a1 = 3/r

    ( 3 r^4/r) = 3/64
    r^3 = 1/64 = 1/2^6
    r = 1/2^2
    r = 1/4
    a1 = 12

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