20 PONTOS, ME AJUDEM
resolva as seguintes equações exponenciais:
Obs: deve ter a resolução
1) 2^x=128
2) 3^2x=243
3) 0,01^x=1000
4) 3^x-5=81
5) 729^2x=27
6) 2^x-2=8
7) 4^x=512
Soluções para a tarefa
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Estou usando notação de programação ( ** ) exponenciação
1 )( 2**x) = 128
( 2**x ) = ( 2**7 )
x = 7
2) ( 3**2x ) = 243
( 3**2x) = ( 3**5)
2x = 5 -> x = 5/2
3) ( 0,01**x) = 1000 -> 0,01 = 1 * ( 10**-2)
( 10 ** -2) ** x = ( 10**3)
-2x = 3
x = -3/2
4) ( 3**(x-5)) = 81 -> (3**(x-5)) = (3**4)
x-5 = 4
x = 9
5) ( 729**2x ) = 27 ->
( ( 27 ** 2 ) **2x ) = 27 ** 1
( 27 ** 4x ) = ( 27 ** 1 )
4x = 1 -> x = 1 / 4
6) ( 2 ** ( x - 2 ) ) = 8
( 2 ** ( x - 2 ) = ( 2** 3)
( x-2 ) = 3 -> x = 5
7) ( 4 ** x ) = 512
( 2 ** 2 ** x ) = ( 2 ** 9 )
( 2 ** 2x ) = ( 2** 9 )
2x = 9
x = 9/2
1 )( 2**x) = 128
( 2**x ) = ( 2**7 )
x = 7
2) ( 3**2x ) = 243
( 3**2x) = ( 3**5)
2x = 5 -> x = 5/2
3) ( 0,01**x) = 1000 -> 0,01 = 1 * ( 10**-2)
( 10 ** -2) ** x = ( 10**3)
-2x = 3
x = -3/2
4) ( 3**(x-5)) = 81 -> (3**(x-5)) = (3**4)
x-5 = 4
x = 9
5) ( 729**2x ) = 27 ->
( ( 27 ** 2 ) **2x ) = 27 ** 1
( 27 ** 4x ) = ( 27 ** 1 )
4x = 1 -> x = 1 / 4
6) ( 2 ** ( x - 2 ) ) = 8
( 2 ** ( x - 2 ) = ( 2** 3)
( x-2 ) = 3 -> x = 5
7) ( 4 ** x ) = 512
( 2 ** 2 ** x ) = ( 2 ** 9 )
( 2 ** 2x ) = ( 2** 9 )
2x = 9
x = 9/2
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