Question

x方-2x+3其中x=2/根3-1

Answer 1

x=2/(√3-1)

=2(√3+1)/(√3-1)(√3+1)

=2(√3+1)/(3-1)

=√3+1

x²-2x+3

=x²-2x+1+2

=(x-1)²+2

=(√3+1-1)²+2

=(√3)²+2

=3+2

=5