Find the 6th term of the binomial theorem (x+2)10

Mathematics

ScanSolve AI Answer

Answer

8064x5\mathbf{8064x^5}

Step-by-step solution

4 steps
  1. Identify the components of the binomial expansion.

    The binomial theorem states that the (r+1)(r+1)-th term of (a+b)n(a+b)^n is given by the formula (nr)an−rbr\binom{n}{r} a^{n-r} b^r.
    In this problem, we have (x+2)10(x+2)^{10}:

    • a=xa = x
    • b=2b = 2
    • n=10n = 10 We need to find the 6th term, so r+1=6r+1 = 6, which means r=5r = 5.
  2. Substitute the values into the formula.

    The 6th term is:

    T6=(105)x10−5(2)5T_{6} = \binom{10}{5} x^{10-5} (2)^5
  3. Calculate the binomial coefficient and powers.

    First, calculate (105)\binom{10}{5}:

    (105)=10!5!(10−5)!=10!5!5!=10×9×8×7×65×4×3×2×1=2×9×2×7=252\binom{10}{5} = \frac{10!}{5!(10-5)!} = \frac{10!}{5!5!} = \frac{10 \times 9 \times 8 \times 7 \times 6}{5 \times 4 \times 3 \times 2 \times 1} = 2 \times 9 \times 2 \times 7 = 252

    Next, calculate the powers:

    x10−5=x5x^{10-5} = x^5 (2)5=32(2)^5 = 32
  4. Combine the results to find the 6th term.

    T6=252⋅x5⋅32T_{6} = 252 \cdot x^5 \cdot 32 T6=8064x5T_{6} = 8064x^5

    The 6th term of the binomial expansion (x+2)10(x+2)^{10} is 8064x5\boxed{\mathbf{8064x^5}}.

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