Question

Qual o valor de x???

Answer 1

$5^{X2 - 2x}$ = $5^{3}$

$x^{2}$ - 2x = 3
$x^{2}$ -2x-3=0

s = -b/a
     -(-2)/1
      2/1
       2
p = c/a= -3/1= -3

3+(-1) = 2
3· (-1) = -3

raizes: 3 e -1