x² - 10x + 3 = 0

D = 100 - 4*3 = 100 - 12 = 88, √D = √88 = 2√22

x1,2 = 10 ± 2√22 / 2 = 5 ± √22

Ответ: 5 ±√22

х^2 - 10х + 3 = 0

k = 1/2b

D = k^2 - ac

D = (-5)^2 - 3 = 22

x = (5 ± √22)/1 = 5 ± √22