Respuesta:
ancho: 7m
largo: 15m
Explicación paso a paso:
[tex]a = x \\ l = x + 8[/tex]
a= ancho (m)
l= largo (m)
A= l•a
[tex](x + 8)(x) = 105 \\ {x}^{2} + 8x - 105 = 0[/tex]
Factorizando
[tex](x - 7)(x + 15) = 0[/tex]
Igualando a 0 ambos factores:
[tex]x + 15 = 0 \\ x = - 15 \: m[/tex]
[tex]x - 7 = 0 \\ x = 7m[/tex]
Elegimos la positiva
X=7m
l=7m+8m=15m
a=7m
Comprobación
(15m)(8m)=105m^2
105m^2=105m^2
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Respuesta:
ancho: 7m
largo: 15m
Explicación paso a paso:
[tex]a = x \\ l = x + 8[/tex]
a= ancho (m)
l= largo (m)
A= l•a
[tex](x + 8)(x) = 105 \\ {x}^{2} + 8x - 105 = 0[/tex]
Factorizando
[tex](x - 7)(x + 15) = 0[/tex]
Igualando a 0 ambos factores:
[tex]x + 15 = 0 \\ x = - 15 \: m[/tex]
[tex]x - 7 = 0 \\ x = 7m[/tex]
Elegimos la positiva
X=7m
l=7m+8m=15m
a=7m
Comprobación
(15m)(8m)=105m^2
105m^2=105m^2