x4-65x2+64=0 паможите

x⁴-65x²+64=0;

x² = t; =>

t² - 65t + 64 = 0;

D = 65² - 4 * 1 * 64 = 4225 - 256 = 3969;

t1 = (65 - 63)/2 = 1;

t2 = (65 + 63)/2 = 64;

x²1 = 1 => x = ±1;

x²2 = 64 => x = ± 8.