👤

Rezolvati in R ecuatia log 4 ( x la a doua +2x -4) =1

Răspuns :

log4(x^2+2x-4)=1 

log a(,x)=y ⇔x=a^y

x^2+2x-4=4^1
x^2+2x-8=0
Δ=b^2-4ac
Δ=2^2-4*1*(-8)
Δ=36

x1=(-2+6)/2=2
x2=(-2-6)/2=-4