Question

Даю 20б
г) 4*х^4-5*х^2+1=0
д)х^4-2.5*х^2-6=0
е)2*у^4-17у^2-9=0

Answer 1

Г) Заменим х² на t:
4t² - 5t + 1 = 0
D = 25 - 16 = 9
t(1) = (5+3)/8 = 1
t(2) = (5-3)/8 = 1/4
Вернём замену:
x² = 1
x(1) = ±1
x² = 1/4
x(2) = ±1/2