Question

sabendo que 2 elevado a x+3 = 32 , determine o valor de 2 elevado -x :
a)4
b)2
c)1/2
d)0
e)1/4

Answer 1

${2}^{x + 3} = 32$

${2}^{x} \times {2}^{3} = 32$

${2}^{x} = \frac{32}{8}$
${2}^{x} = 4$
$x = 2$
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${2}^{ - 2} = \frac{1}{ {2}^{2} }$

${2}^{ - 2} = \frac{1}{4}$

Letra e)