Question

√x-1 +x-1=2 (+x-1 nu se afla sub radical)

Answer 1

√x-1+x-1=2 ridicam la patrat si vine
x-1+x²-1²=2²
x²+x-2=4
x²+x-6=0
a=1, b=1,c=-6
∆=b²-4ac
∆=1-4*1*(-6)
∆=1-24
∆=25
x1,2=-b-+√∆\2a
x1=-6/2 =-3
x2=4/2=2