Question

Решите уравнение! 194(1,2)

Answer 1

1) y^4-7y^2-8=0
y^2=r, r^2-7r-8=0
D=49+32=81
r1=8 r2=-1
y1=2~/2  y2=-1

2)m^4+26m^2-27=0
m^2=n, n^2+26n-27=0
D=676+108=784
n1=27  n2=-1
m1=3~/3   m2=-1

~/ знак корня