Объяснение:

uz⁴+uy⁴-yz⁴-y⁵=(uz⁴+uy⁴)-(yz⁴+y⁵)=

=u(z⁴+y⁴)-y(z⁴+y⁴)=(u-y)(z⁴-y⁴)

13z²+65z-(z+5)=0

13z²+65z-z-5=0

13z²+64z-5=0

D=64²-4•13•(-5)=4096+260=4356

z1=(-64-66)/2•13= -5

z2=(-64+66)/26=2/26=1/13