Question

me ajuda pfv preciso ​

Answer 1

Resposta:

B=13\2

C= -1\3

Explicação passo a passo:

B)2³x-27=  2-x-1

3x - 27 = -x-1

3x+ x = -1+27

4x = 26

x=13\2

C) (2\3)³x+1 = (2\3) 0

3x + 1 = 0

3x= - 1

x = - 1\3

Answer 2

O desenvolvimento das expressões é feita a seguir.

• Resolvendo o problema

Letra b)

$8^{(x-9)}=\left(\dfrac{1}{2}\right)^{(x+1)}\\\\\\(2^3)^{(x-9)}=(2^{-1})^{(x+1)}\\\\\\2^{[3\;.\;(x-9)]}=2^{[-1\;.\;(x+1)]}\\\\\\3\;.\;(x-9)=-1\;.\;(x+1)\\\\\\3x-27=-x-1\\\\\\3x+x=27-1\\\\\\4x=26\\\\\\x=\dfrac{26}{4}\\\\\\\boxed{x=\dfrac{13}{2}}$

Letra c)

$\left(\dfrac{2}{3}\right)^{(3x+1)}=1\\\\\\\left(\dfrac{2}{3}\right)^{(3x+1)}=\left(\dfrac{2}{3}\right)^0\\\\\\3x+1=0\\\\\\3x=-1\\\\\\\boxed{x=-\dfrac{1}{3}}$