What does it mean by:

Question

Show that the "value of 3x^2-6x+5" cannot be less than 1. ?

Answer 1

show the opposite: the value is <1

3x^2-6x+5<1
3x^2-6x+4<0

x= (6+-sqrt(36-48))/6

well the serd here is imaginary. So the assumption of being less than one is false.