Question
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d) \( (x+2)^{3} \)

Ask by Blake Pope. in Colombia
Mar 09,2025

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Tutor-Verified Answer

Answer

\[ (x+2)^3 = x^3 + 6x^2 + 12x + 8 \]

Solution

1. Primero, escribimos la expresión como un producto de tres factores: \[ (x+2)^3=(x+2)(x+2)(x+2) \] 2. Multiplicamos los dos primeros factores: \[ (x+2)(x+2)=x^2+2x+2x+4=x^2+4x+4 \] 3. Ahora, multiplicamos el resultado por el tercer factor: \[ (x^2+4x+4)(x+2) \] 4. Realizamos la multiplicación término a término: \[ \begin{aligned} x^2\cdot x &= x^3,\\[5mm] x^2\cdot 2 &= 2x^2,\\[5mm] 4x\cdot x &= 4x^2,\\[5mm] 4x\cdot 2 &= 8x,\\[5mm] 4\cdot x &= 4x,\\[5mm] 4\cdot 2 &= 8. \end{aligned} \] 5. Sumamos los términos semejantes: \[ x^3+\underbrace{(2x^2+4x^2)}_{6x^2}+\underbrace{(8x+4x)}_{12x}+8 \] Esto resulta en: \[ x^3+6x^2+12x+8. \] 6. Por lo tanto, la expansión es: \[ (x+2)^3=x^3+6x^2+12x+8. \]

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Extra Insights

Did you know that the expression \( (x+2)^{3} \) can be expanded using the Binomial Theorem? This theorem reveals that \( (a+b)^n = \sum_{k=0}^{n} \binom{n}{k} a^{n-k} b^k \). For our expression, this translates to \( x^3 + 3(2)x^2 + 3(2^2)x + 2^3 \), which simplifies to \( x^3 + 6x^2 + 12x + 8 \). It’s a fantastic way to see the power of algebra! If you ever find yourself needing to tackle polynomials like this, remember to watch out for common mistakes! A frequent pitfall is forgetting to correctly apply the powers to each term when expanding. For instance, it’s easy to mistakenly compute \( 2^3 \) as \( 6 \) instead of \( 8 \). Always double-check your calculations while keeping track of all the terms to avoid losing points on homework or exams!

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