Răspuns:
Explicație pas cu pas:
x²+1/x²=x²+1/x²+2-2=(x+1/x)²-2=4²-2=16-2=14
x³+1/x³=( x+1/x)³-3(x+1/x)*x*1/x=4³-3*4*1=64-12=52
( !!!!!!!!!!!!!!!!!!dezvoltatrea (a+b) ³= a³+b³+3ab(a+b) NU INTRA in programa de gimnaziu/Ev Nationale)
x^4+1/x^4= (x²+1/x²)²-2x²*1/x²=14²-2=196-2=194