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Given the formula for the n-th term of a sequence is Tn = 2 * 2n - 2, simplify the formula and find the first four terms.

Mathematics

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Answer

Tn=4n−2T_n = 4n - 2

2,6,10,14,…2, 6, 10, 14, \dots

Step-by-step solution

2 steps

The image shows the formula for the nn-th term of a sequence: Tn=2×2n−2T_n = 2 \times 2n - 2.

  1. Simplify the expression for TnT_n.

    First, perform the multiplication 2×2n2 \times 2n.

    Tn=4n−2T_n = 4n - 2

    This is the general formula for the nn-th term of the sequence.

  2. Find the first few terms of the sequence using the simplified formula.

    To find the first term (T1T_1), substitute n=1n=1:

    T1=4(1)−2=4−2=2T_1 = 4(1) - 2 = 4 - 2 = 2

    To find the second term (T2T_2), substitute n=2n=2:

    T2=4(2)−2=8−2=6T_2 = 4(2) - 2 = 8 - 2 = 6

    To find the third term (T3T_3), substitute n=3n=3:

    T3=4(3)−2=12−2=10T_3 = 4(3) - 2 = 12 - 2 = 10

    To find the fourth term (T4T_4), substitute n=4n=4:

    T4=4(4)−2=16−2=14T_4 = 4(4) - 2 = 16 - 2 = 14

    The simplified formula for the nn-th term is Tn=4n−2\boxed{T_n = 4n - 2}.
    The first few terms of the sequence are 2,6,10,14,…\boxed{2, 6, 10, 14, \dots}.

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