Di bantu kak!! aku gk ngerti ni!!

x^2 - 5x + 6 = 0
x1 = 3, x2 = 2
a) x1 + x2= 3+2=5, x1:x2 = 3:2
b)1/x1 + 1/x2 = 1/3 + 1/2 = 2/6 + 3/6 = 5/6
c)x1^2 + x2^2 = 3^2+2^2 = 9+4=13
d)x1/x2 + x2/x1 =  3/2 +2/3 = 9/6 + 6/9 = 15/15=1