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Solve for [tex]\( B \)[/tex]:

[tex]\[ B = (x-3)^2 - (x-1)^2 + 4x \][/tex]

a) 1
b) 2
c) 3
d) 7
e) 8


Sagot :

Para resolver la expresión [tex]\( B = (x - 3)^2 - (x - 1)^2 + 4x \)[/tex] y evaluarla en [tex]\( x = 1 \)[/tex], seguimos estos pasos detallados:

1. Expandir los cuadráticos:

Expandimos cada término cuadrático por separado:
[tex]\[ (x - 3)^2 = x^2 - 6x + 9 \][/tex]
[tex]\[ (x - 1)^2 = x^2 - 2x + 1 \][/tex]

2. Sustituir las expresiones expandidas en la fórmula original:

Ahora sustituimos estas expresiones en [tex]\( B \)[/tex]:
[tex]\[ B = (x^2 - 6x + 9) - (x^2 - 2x + 1) + 4x \][/tex]

3. Simplificar la expresión:

Haríamos la resta distribuyendo los signos:
[tex]\[ B = (x^2 - 6x + 9) - x^2 + 2x - 1 + 4x \][/tex]

Luego, combinamos los términos semejantes:
[tex]\[ B = x^2 - x^2 - 6x + 2x + 4x + 9 - 1 \][/tex]
[tex]\[ B = 0x^2 + 0x + 8 \][/tex]
[tex]\[ B = 8 \][/tex]

4. Evaluar en [tex]\( x = 1 \)[/tex]:

Observamos que una vez simplificada, la expresión resultante es constante (8), por lo que substituyendo [tex]\( x \)[/tex] da como resultado la misma constante:
[tex]\[ B = 8 \][/tex]

Por lo tanto, al evaluar [tex]\( B \)[/tex] en [tex]\( x = 1 \)[/tex], el valor es:
[tex]\[ \boxed{8} \][/tex]
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