Question

pessoal pode me ajudar com essas perguntas pfv preciso entregar amanhã

se puderem colocar a conta pfv agredeço​

Answer 1

Resposta:

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Explicação passo-a-passo:

11)

$Log_33+Log_327+Log_55\\1 +Log_33^3 +1\\1+3+1\\5$

c) 5

12)

$Log_2x=4\\x = 2^4\\x = 16$

b) 16

13)

$Log100000000\\Log10^{8}\\8$

c) 8

14)

$2^{x^2-7x+12}=1\\2^{x^2-7x+12}=2^0\\x^2-7x+12=0$

x = -b±√Δ /2.a

Δ = b² -4.a.c

x = -(-7) ±√( (-7)²-4.1.12) /2.1

x = 7 ±√(49-48) /2

x = 7 ±√1 /2

x = 7 ±1 /2

x' = 7 +1 /2 = 8 /2 = 4

x'' = 7 -1 /2 = 6 /2 = 3

a) 3 e 4

15)

$3^{2x-8}=81\\3^{2x-8}=3^4\\2x-8=4\\2x = 4+8\\x = 12/2\\x = 6$

c) x = 6

16)

$10^{3x-2}=10000000\\10^{3x-2} = 10^{7}\\\\3x-2=73x = 7+2\\x = 9/3\\x = 3$

a) x = 3

17)

$2^{x+3} = \frac{1}{8}\\2^{x+3} = (\frac{1}{2})^3\\2^{x+3} = 2^{-3}\\\\x+3=-3\\x = -3-3\\x = -6$

d) -6

Dúvidas só perguntar!