Question

решить уравнение log2 x-1/x+4 + log2 ((x-1)(x+4))=2

Answer 1

log2 [(x-1)/(x+4)]*[(x-1)*(x+4)=2
log2 (x-1)^2=log2 2^2
(x-1)^2=2^2
x^2-2x-3=0
x=-1,x=3