Объяснение:
x^4 - 17x+16=0
x^4 = t^2
x = t
t^2 - 17t + 16 = 0
D = 289 - 4 * 1 * 16 = 289 - 64 = 225
√D = 15
t1 = (17 + 15) /2 = 16
t2= (17 - 15) /2 = 1
