Respostas

2013-11-20T00:07:16-02:00
0,25^x = 64
(1/4)^x = 2^6
2^(-2x) = 2^6
-2x = 6
x = -6/2 = -3
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  • Usuário do Brainly
2013-11-20T00:17:37-02:00
25:25------ 1 ------- 1
--------- = ------ = ------- =  2^-2
100:25----- 4 ------ 2^2


64/2
32/2
16/2
8/2
4/2
2/2
1

64 = 2^6

log64 na base 0,25

0,25^x = 64
2^-2x = 2^6
- 2x = 6
multiplique por (-1)
- 2x = 6 .(-1)
2x = - 6
x =  \frac{-6}{2}
x = - 3

resposta: log 64 na base 0,25 = - 3



3 5 3