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\( y = 2 x ^ { 2 } + \frac { 1 } { 2 } x ^ { 3 } - 2 x \)

Ask by Dickson Cross. in Mexico
Mar 12,2025

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Answer

Las soluciones para \( y = 0 \) son \( x = 0 \), \( x = -2 + 2\sqrt{2} \) y \( x = -2 - 2\sqrt{2} \).

Solution

1. Escribimos la función: \[ y = 2 x^2 + \frac{1}{2} x^3 - 2x \] 2. Observamos que todos los términos tienen el factor \( x \). Por ello, factorizamos \( x \): \[ y = x \left(\frac{1}{2} x^2 + 2x - 2\right) \] 3. Para encontrar las raíces o puntos donde \( y = 0 \), igualamos la función a cero: \[ x \left(\frac{1}{2} x^2 + 2x - 2\right) = 0 \] Se tienen dos casos: - Caso 1: \( x = 0 \) - Caso 2: Resolver la ecuación cuadrática: \[ \frac{1}{2} x^2 + 2x - 2 = 0 \] 4. Para el caso 2, multiplicamos la ecuación por 2 para eliminar el coeficiente fraccionario: \[ x^2 + 4x - 4 = 0 \] 5. Aplicamos la fórmula general para resolver ecuaciones cuadráticas, que es: \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] Aquí, \( a = 1 \), \( b = 4 \) y \( c = -4 \). Sustituyendo: \[ x = \frac{-4 \pm \sqrt{4^2 - 4 \cdot 1 \cdot (-4)}}{2 \cdot 1} = \frac{-4 \pm \sqrt{16 + 16}}{2} = \frac{-4 \pm \sqrt{32}}{2} \] 6. Simplificamos la raíz: \[ \sqrt{32} = 4 \sqrt{2} \] Entonces: \[ x = \frac{-4 \pm 4\sqrt{2}}{2} = -2 \pm 2\sqrt{2} \] 7. Finalmente, las soluciones para \( y = 0 \) son: \[ x = 0,\quad x = -2 + 2\sqrt{2},\quad x = -2 - 2\sqrt{2} \]

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Mind Expander

Did you know that polynomial functions like the one you provided can be graphed to show their parabolic nature? In this case, the highest degree term is \( \frac{1}{2}x^3 \), indicating that the graph will have a cubic shape with possible turning points. The interplay of the coefficients can create fascinating curves and local maxima or minima you can explore by calculus. If you're solving for the roots of this polynomial, a common mistake is overlooking the factorization or using the wrong method for polynomials of degree greater than two. Always check for rational roots using the Rational Root Theorem first, and remember that software tools or numerical methods can help you find approximations when things get tricky!

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