решите уровнение 4x^4-17x^2+4=0

Question

решите уровнение 4x^4-17x^2+4=0

Answer 1

4x^4-17x^2+4=0

Answer 2

x^2=t

4t^2-17t+4=0

D=289-4*4*4=225

t1=17+15/8=4

t2=17-15/8=1/4

________________

x^2=4 = -2 и 2 

x^2=1/4 = 1/2 и -1/2