Question

^2-8х+15 найти корни трехчлена

Answer 1

x2 - 8x + 15 = 0
D = b2 - 4ac
D = 64 - 60 = 4 = 2^2

x1,2 = -b ± √D/2a
x1 = 8 + 2/2= 10/2 = 5
x2 = 8 - 2/2= 6/2= 3
Ответ: x1 = 5; x2 = 3