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3. Resuelve los siguientes problemas.

Si:

[tex]\[
\begin{array}{l}
A = 2x^2 + x - 6 \\
B = 7x^2 - 5x - 10 \\
C = 5x^2 - 4x - 1
\end{array}
\][/tex]

Hallar: [tex]\(A + B - C\)[/tex]

Sagot :

Para resolver el problema de hallar [tex]\(A + B - C\)[/tex] donde se nos dan las siguientes funciones polinómicas:

[tex]\[ \begin{array}{l} A = 2x^2 + x - 6 \\ B = 7x^2 - 5x - 10 \\ C = 5x^2 - 4x - 1 \end{array} \][/tex]

Vamos a seguir los siguientes pasos:

1. Expresar los polinomios dados:
[tex]\[ A = 2x^2 + x - 6 \][/tex]
[tex]\[ B = 7x^2 - 5x - 10 \][/tex]
[tex]\[ C = 5x^2 - 4x - 1 \][/tex]

2. Sumar los polinomios [tex]\(A\)[/tex] y [tex]\(B\)[/tex]:
[tex]\[ A + B = (2x^2 + x - 6) + (7x^2 - 5x - 10) \][/tex]
Agrupando los términos semejantes:
[tex]\[ A + B = (2x^2 + 7x^2) + (x - 5x) + (-6 - 10) \][/tex]
Simplificando:
[tex]\[ A + B = 9x^2 - 4x - 16 \][/tex]

3. Restar el polinomio [tex]\(C\)[/tex] del resultado anterior:
[tex]\[ (A + B) - C = (9x^2 - 4x - 16) - (5x^2 - 4x - 1) \][/tex]
Agrupando los términos semejantes:
[tex]\[ (A + B) - C = (9x^2 - 5x^2) + (-4x + 4x) + (-16 + 1) \][/tex]
Simplificando:
[tex]\[ (A + B) - C = 4x^2 + 0x - 15 \][/tex]

Finalmente, al reducir los términos, obtenemos el resultado:

[tex]\[ A + B - C = 4x^2 - 15 \][/tex]

Por lo tanto, la expresión simplificada de [tex]\(A + B - C\)[/tex] es:

[tex]\[ 4x^2 - 15 \][/tex]
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