1) Resolva as equações
Anexos:
Soluções para a tarefa
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a)3^(x-1)=81
3^(x-1)=3^4
X-1=4
x=4+1
x=5
b)(1/2)^x = ³/¨¨4
(2^(-1))^x=2^(2/3)
2^(-x)=2^(2/3)
-x=2/3 *(-1)
x=-2/3
c)0,75^x=9/16
(4/3)^x=3^2/4^2
(4/3)^x=(3/4)^2
x=2
d)9^(x+1) =1/3^3
9^(x+1) = 3^(-3)
x+1=-3
x=-3-1
x=-4
e)2^(x^2 -3x -4)=1
2^x= y
(2^x)^x * (2^x)^-3 * (2^1)^-4=1
x-3-4=1
x-7=1
x=1+7
x=8
3^(x-1)=3^4
X-1=4
x=4+1
x=5
b)(1/2)^x = ³/¨¨4
(2^(-1))^x=2^(2/3)
2^(-x)=2^(2/3)
-x=2/3 *(-1)
x=-2/3
c)0,75^x=9/16
(4/3)^x=3^2/4^2
(4/3)^x=(3/4)^2
x=2
d)9^(x+1) =1/3^3
9^(x+1) = 3^(-3)
x+1=-3
x=-3-1
x=-4
e)2^(x^2 -3x -4)=1
2^x= y
(2^x)^x * (2^x)^-3 * (2^1)^-4=1
x-3-4=1
x-7=1
x=1+7
x=8
MarcioRicardo17:
ops. cometi um equívoco na e)
x-3*2^(-4)=1 , x-3*(1/2^4)=1 , x-(3/16)=1 , (16x-3)/16 =1 , 16x=16-3 , x=13/16
"
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