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Log2(x^2+4)=log2(x+4)?!???

Răspuns :

log2(x²+4)=log2(x+4)⇒+vorbim de aceeasi baza log 2
CE⇒X²+4≥0
RENUNTAM LA BAZA SI AVEM
x²+4=x+4⇒x²-x+4-4=0⇒x²-x-0=0
a=1
b=1
c=0
d=b²-4ac=1²-4×1×0⇒d=1-0⇒d=1⇒√d=⇒√1⇒d=1⇒
x1x2=-b+-√d/2a
x1=-1+1/2⇒0/2⇒x1=0
x2=-1-1/2⇒-2/2⇒x2=-1
sucees