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Sagot :
Vamos a resolver el problema paso a paso. Se nos da el conjunto [tex]\( M = \{3a + 2, 2b + 4, 14\} \)[/tex] y sabemos que es un conjunto unitario, lo que significa que todos sus elementos son iguales entre sí. Es decir, todos deben ser igual a 14.
1. Igualamos el primer elemento a 14:
[tex]\[ 3a + 2 = 14 \][/tex]
Resolviendo para [tex]\(a\)[/tex]:
[tex]\[ 3a + 2 = 14 \\ 3a = 14 - 2 \\ 3a = 12 \\ a = \frac{12}{3} \\ a = 4 \][/tex]
2. Igualamos el segundo elemento a 14:
[tex]\[ 2b + 4 = 14 \][/tex]
Resolviendo para [tex]\(b\)[/tex]:
[tex]\[ 2b + 4 = 14 \\ 2b = 14 - 4 \\ 2b = 10 \\ b = \frac{10}{2} \\ b = 5 \][/tex]
3. Calculamos el valor de [tex]\(a \cdot b\)[/tex]:
[tex]\[ a \cdot b = 4 \cdot 5 = 20 \][/tex]
Por tanto, el valor de [tex]\(a \cdot b\)[/tex] es [tex]\(20\)[/tex].
La respuesta correcta es:
c) 20
1. Igualamos el primer elemento a 14:
[tex]\[ 3a + 2 = 14 \][/tex]
Resolviendo para [tex]\(a\)[/tex]:
[tex]\[ 3a + 2 = 14 \\ 3a = 14 - 2 \\ 3a = 12 \\ a = \frac{12}{3} \\ a = 4 \][/tex]
2. Igualamos el segundo elemento a 14:
[tex]\[ 2b + 4 = 14 \][/tex]
Resolviendo para [tex]\(b\)[/tex]:
[tex]\[ 2b + 4 = 14 \\ 2b = 14 - 4 \\ 2b = 10 \\ b = \frac{10}{2} \\ b = 5 \][/tex]
3. Calculamos el valor de [tex]\(a \cdot b\)[/tex]:
[tex]\[ a \cdot b = 4 \cdot 5 = 20 \][/tex]
Por tanto, el valor de [tex]\(a \cdot b\)[/tex] es [tex]\(20\)[/tex].
La respuesta correcta es:
c) 20
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