Question

f) \( 12 x^{2}-x-6 \)

Ask by Dunn West. in Mexico
Mar 13,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

La factorización de \(12x^2 - x - 6\) es \((3x + 2)(4x - 3)\).

Solution

1. Calculamos el producto de \(a\) y \(c\) en el trinomio \(12x^2 - x - 6\): \[ 12 \times (-6) = -72 \] 2. Buscamos dos números que al multiplicarlos den \(-72\) y al sumarlos den \(-1\) (coeficiente lineal). Los números son \(8\) y \(-9\), ya que: \[ 8 \times (-9) = -72 \quad \text{y} \quad 8 + (-9) = -1 \] 3. Reescribimos el término \(-x\) utilizando \(8x\) y \(-9x\): \[ 12x^2 - x - 6 = 12x^2 + 8x - 9x - 6 \] 4. Agrupamos los términos: \[ (12x^2 + 8x) + (-9x - 6) \] 5. Factorizamos en cada grupo: - En el primer grupo factorizamos \(4x\): \[ 12x^2 + 8x = 4x(3x + 2) \] - En el segundo grupo factorizamos \(-3\): \[ -9x - 6 = -3(3x + 2) \] 6. Extraemos el factor común \((3x + 2)\): \[ 12x^2 - x - 6 = (3x + 2)(4x - 3) \] La factorización final es: \[ (3x+2)(4x-3) \]

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Beyond the Answer

Did you know that factoring quadratic equations like \( 12x^2 - x - 6 \) can be likened to solving a puzzle? You’re trying to find two numbers that give you the middle coefficient and when multiplied, yield the product of the leading coefficient and the constant term. In this case, you want two numbers that multiply to \(-72\) (since \(12 \times -6\)) and add up to \(-1\). The magic numbers here are \(8\) and \(-9\). Now, let's put those numbers to good use! You can re-write the middle term using \(8\) and \(-9\) as \(12x^2 + 8x - 9x - 6\). Then, factor by grouping! Pull out common factors from the first and second pairs: \(4x(3x + 2) - 3(3x + 2)\). Voila! You’ve factored it into \((3x + 2)(4x - 3)\). Solving quadratic equations can be like magic, don’t you think?

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