Question

calcule x(1-x) (x-2)


(x).(-1x).x

Answer 1

(x+1/x)²= x²+2·x·1/x+ 1/x²= x²+ 1/x² + 2

Se x²+ 1/x²=6 -->(x+1/x)²= 6+ 2=8 --> x+1/x= ±√8 --> x+1/x= 2√2 ou x+1/x= -2√2