Question

me ajudem por favor​

Answer 1

Ok , vamos lá !!

❒  Resoluções :

3 )

Letra A

$\sf log_{3}(x + 4) = 2$

$\sf {3}^{2} = x + 4$

$\sf 9 = x + 4$

$\sf x + 4 = 9$

$\sf x = 9 - 4$

$\red{\sf x = 5}$

Letra B

$\sf log_{5}(2x - 4) = 0$

$\sf {5}^{0} = 2x - 4$

$\sf 1 = 2x - 4$

$\sf 2x - 4 = 1$

$\sf 2x = 1 + 4$

$\sf 2x =5$

$\red{\sf x = \dfrac{5}{2} }$

4 )

Letra A

$\sf log(6)$

$\sf log(3\cdot 2)$

$\sf log(3) + log(2)$

$\sf 0,4771 + 0,3010$

$\red{\sf ≈0,7781}$

Letra B

$\sf log(24)$

$\sf log(6\cdot 4)$

$\sf log(6) + log(4)$

$\sf log(3\cdot 2) + log(2\cdot 2)$

$\sf log(3) + log(2) + log(2) + log(2)$

$\sf 0,4771 + 0,3010+ 0,3010+ 0,3010$

$\red{\sf ≈1,3801}$

Letra C

$\sf log(128)$

$\sf log(32\cdot 4)$

$\sf log(32) + log(4)$

$\sf log(4\cdot 3\cdot 3) + log(2\cdot 2)$

$\sf log(4) + log(3) + log(3) + log(2) + log(2)$

$\sf log(2\cdot 2) + log(3) + log(3) + log(2) + log(2)$

$\sf log(2) + log(2) + log(3) + log(3) + log(2) + log(2)$

$\sf 0,3010 + 0,3010 + 0,4771 + 0,4771 + 0,3010 + 0,3010$

$\red{\sf ≈2,1582}$

Bons estudos .