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Find the 3 rd term of \( (x+2)^{8} \) \( \frac{4 x^{6}}{28 x^{6}} \) \( \frac{448 x^{5}}{112 x^{6}} \)

Ask by Wright Boyd. in the United States
Nov 09,2024

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The 3rd term of \( (x+2)^{8} \) is \( 112x^{6} \).

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To find the 3rd term of \( (x+2)^{8} \), we use the Binomial theorem, which states that the \( r \)-th term in the expansion of \( (a + b)^{n} \) is given by \( T_{r} = \binom{n}{r-1} a^{n-(r-1)} b^{r-1} \). Here, \( a = x \), \( b = 2 \), and \( n = 8 \). For the 3rd term, set \( r = 3 \): \[ T_{3} = \binom{8}{2} x^{8-2} \cdot 2^{2} = \binom{8}{2} x^{6} \cdot 4. \] Calculating \( \binom{8}{2} = \frac{8 \times 7}{2 \times 1} = 28 \): \[ T_{3} = 28 \cdot x^{6} \cdot 4 = 112 x^{6}. \] So, the 3rd term of \( (x+2)^{8} \) is \( 112 x^{6} \). Now, looking at the fractions given: 1. For \( \frac{4 x^{6}}{28 x^{6}} \), simplifying gives \( \frac{4}{28} = \frac{1}{7} \). 2. For \( \frac{448 x^{5}}{112 x^{6}} \), simplifying gives \( \frac{448}{112} = 4 \) and \( x^{5}/x^{6} = \frac{1}{x} \), resulting in \( 4/x \). These calculations show how simplifications and term extractions can relate to the original polynomial expansion.math to terminology.

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