Раскрываем скобки.
16x⁴ - 20x² + 4 = 0 | :4
4x⁴ - 5x² + 1 = 0
x² = t
4t² - 5t + 1 = 0
D = 9
t1 = 1
t2 = 1/4
x² = 1
x1 = 1 ; x2 = -1
x² = 1/4
x3 = 1/2 ; x4 = -1/2
Раскрываем скобки.
16x⁴ - 20x² + 4 = 0 | :4
4x⁴ - 5x² + 1 = 0
x² = t
4t² - 5t + 1 = 0
D = 9
t1 = 1
t2 = 1/4
x² = 1
x1 = 1 ; x2 = -1
x² = 1/4
x3 = 1/2 ; x4 = -1/2