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Isaferracioli22
@Isaferracioli22
December 2019
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Pfvrrr alguéééémm me ajudaaaa
Resolva, em R, as equações logarítmicas a seguir e dê o conjunto solução:
a) log de x na base 1/2 + log de (x+2) na base 1/2 = -3
b) log de ( x+1) + 1 = log (x² + 35)
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xjoaovitordfovd2qj
A) log1/2(x) + log1/2(x+2)= -3
Usando a propriedade de multiplicaçao:
log1/2 [x(x+2)]=-3
log1/2 (x^2+2x)=-3
(1/2)^-3=x^2+2x
8=x^2+2x
x^2+2x-8=0
Usando bhaskara
^=-2^2-4.1.(-8)
^= 4+32
^=36
x=-2+-RAIZ36/2
x=-2+-6/2
x1= -2+6/2=2
x2= -2-6/2=-5
SOLUÇAO=(2)
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Usando a propriedade de multiplicaçao:
log1/2 [x(x+2)]=-3
log1/2 (x^2+2x)=-3
(1/2)^-3=x^2+2x
8=x^2+2x
x^2+2x-8=0
Usando bhaskara
^=-2^2-4.1.(-8)
^= 4+32
^=36
x=-2+-RAIZ36/2
x=-2+-6/2
x1= -2+6/2=2
x2= -2-6/2=-5
SOLUÇAO=(2)