Question

logx + log (x+9)=1 ayuda :,D

Answer 1

Holu

Log x + log (x+9) = 1

Log x(x+9) = 1

Log (x²+9x) = 1

10¹ = x²+9x

0 = x²+9x-10

0 = (x+10)(x-1)

x= -10

x = 1

Respuesta → x € { -10 ; 1 }