Question

Решить уравнение   x^2-13x+36=0

Answer 1

D=169-144=25

х1=(13+5)/2=9

х2=*13-5)/2=4

Answer 2

D= b^2 - 4ac = 13^2 - 4 * 1 * 36= 169 - 144 = 25

x = 13+5/ 2 = 9

x= 13-5/ 2 = 4