Question

Resolver as expressões exponenciais:

Answer 1

Oie, Td Bom?!

1.

$2 {}^{x} = 128$

$2 {}^{x} = 2 {}^{7}$

• Bases iguais, iguale os expoentes.

$x = 7$

2.

$3 {}^{x} = 343$

$log_{3}(3 {}^{x} ) = log_{3}(343)$

$x = log_{3}(7 {}^{3} )$

$x = 3 log_{3}(7)$

$x≈5,31$

3.

$(\frac{1}{5} ) {}^{x} = 125$

$5 {}^{ - x } = 5 {}^{3}$

• Bases iguais, iguale os expoentes.

$- x = 3 \: . \: ( - 1)$

$x = - 3$

Att. Makaveli1996