Question
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2. Scan \( A \) y \( B \) dos angulos complementarios, con \( A=5(x+4)^{\circ} \) y \( B=(7 x-2)^{\circ} \). Determi- na la medida del angulo \( B \).

Ask by Henry Cox. in Mexico
Jan 22,2025

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Tutor-Verified Answer

Answer

La medida del ángulo \( B \) es \( 40^\circ \).

Solution

Para determinar la medida del ángulo \( B \), seguimos los siguientes pasos: ### Datos: - Ángulos complementarios: \( A + B = 90^\circ \) - \( A = 5(x + 4)^\circ \) - \( B = (7x - 2)^\circ \) ### Paso 1: Establecer la ecuación de complementarios \[ A + B = 90^\circ \] \[ 5(x + 4) + (7x - 2) = 90 \] ### Paso 2: Expandir y simplificar la ecuación \[ 5x + 20 + 7x - 2 = 90 \] \[ (5x + 7x) + (20 - 2) = 90 \] \[ 12x + 18 = 90 \] ### Paso 3: Resolver para \( x \) \[ 12x + 18 = 90 \] \[ 12x = 90 - 18 \] \[ 12x = 72 \] \[ x = \frac{72}{12} \] \[ x = 6 \] ### Paso 4: Calcular la medida de \( B \) \[ B = 7x - 2 \] \[ B = 7(6) - 2 \] \[ B = 42 - 2 \] \[ B = 40^\circ \] ### **Respuesta:** La medida del ángulo \( B \) es \( 40^\circ \).

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Para resolver el problema, primero recordamos que dos ángulos son complementarios si la suma de sus medidas es \( 90^\circ \). Entonces, podemos establecer la siguiente ecuación: \[ 5(x+4) + (7x - 2) = 90 \] Desarrollamos la ecuación: \[ 5x + 20 + 7x - 2 = 90 \] \[ 12x + 18 = 90 \] \[ 12x = 90 - 18 \] \[ 12x = 72 \] \[ x = 6 \] Ahora sustituimos \( x \) en la expresión para \( B \): \[ B = 7(6) - 2 = 42 - 2 = 40 \] Así que la medida del ángulo \( B \) es \( 40^\circ \). ¡Listo! Ahora lo sabemos, el ángulo \( B \) es \( 40^\circ \).

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