Resposta:
Explicação passo a passo:
22.
4^2x=1
4^2x=4^0
2x=0
x=0/2
x=0
23.
(2^x)^x=16
2^x²=2^4
x²=4
x=√4
x=+2 ou x=-2
24.
3^2x-1=1/3
3^2x-1=3^-1
2x-1=-1
2x=-1+1
25.
2^x+3=1/4
2^x+3=(1/2)^2
2^x+3=2^-2
x+3=-2
x=-2-3
x=-5
27.
6^x²-2x+1=1
6^x²-2x+1=6^0
x²-2x+1=0
a=1
b=-2
c=1
x=2+-V(-2)²-4.1.1/2.1
x=2+-V4-4/2
x=2+-V0/2
x=2/2
x=1
28.
8^x²+2=16^x+3/2
(2^3)^x²+2=(2^4)^x+3/2
2^3x²+6=2^4x+12/2
2^3x²+6=4x+6
3x²+6=4x+6
3x²-4x+6-6=0
3x²-4x=0
x(3x+4)=0
3x+4=0
3x=0-4
3x=-4
x=-4/3
29.
3^x²-1=9^x+1
3^x²-1=(3^2)^x+1
3^x²-1=3^2x+2
x²-1=2x+2
x²-2x-1-2=0
x²-2x-3=0
c=-3
x=2+-V(-2)²-4.1.-3/2.1
x=2+-V4+12/2
x=2+-V16/2
x=2+-4/2
x'=2+4/2=6/2=3
x''=2-4/2=-2/2=-1
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Resposta:
Explicação passo a passo:
22.
4^2x=1
4^2x=4^0
2x=0
x=0/2
x=0
23.
(2^x)^x=16
2^x²=2^4
x²=4
x=√4
x=+2 ou x=-2
24.
3^2x-1=1/3
3^2x-1=3^-1
2x-1=-1
2x=-1+1
2x=0
x=0/2
x=0
25.
2^x+3=1/4
2^x+3=(1/2)^2
2^x+3=2^-2
x+3=-2
x=-2-3
x=-5
27.
6^x²-2x+1=1
6^x²-2x+1=6^0
x²-2x+1=0
a=1
b=-2
c=1
x=2+-V(-2)²-4.1.1/2.1
x=2+-V4-4/2
x=2+-V0/2
x=2/2
x=1
28.
8^x²+2=16^x+3/2
(2^3)^x²+2=(2^4)^x+3/2
2^3x²+6=2^4x+12/2
2^3x²+6=4x+6
3x²+6=4x+6
3x²-4x+6-6=0
3x²-4x=0
x(3x+4)=0
x=0
3x+4=0
3x=0-4
3x=-4
x=-4/3
29.
3^x²-1=9^x+1
3^x²-1=(3^2)^x+1
3^x²-1=3^2x+2
x²-1=2x+2
x²-2x-1-2=0
x²-2x-3=0
a=1
b=-2
c=-3
x=2+-V(-2)²-4.1.-3/2.1
x=2+-V4+12/2
x=2+-V16/2
x=2+-4/2
x'=2+4/2=6/2=3
x''=2-4/2=-2/2=-1