Mathematic Problems
366. példa

Solve the following inequality on the set of real numbers!

x2-x-2=0
a=1, b=-1, c=-2
x1,2=--1±-12-4·1·-22·1
x1,2=1±1+82
x1,2=1±92
x1,2=1±32
x1=1+32 ; x2=1-32
x1=2 ; x2=-1
a=1 x-1,2
x-1,2