Question

rezolvati in R ecuatia (x-1)f(x-1)=3

Answer 1

(x-1)*[2(x-1)+1]=3
(x-1)*(2x-2+1)=3
(x-1)*(2x-1)=3
2x²-x-2x+1=3
2x²-3x-2=0
Δ=9+16=25⇒√Δ=5
x1,2=3+-5/4
x1=8/4=2
x2=-2/4=-1/2
S:x∈{2,-1/2}