Root sign (negative 1 and 9 / 16);

Root sign (negative 1 and 9 / 16) & #178; = root sign (- 25 / 16) & #178; = 25 / 16

Decomposition factor A & # 178; - 16 (a-b) &# 178;

The results are as follows
a²+b²=[(a+b)²+(a-b)²]/2
=(16+4)/2
=10
ab=[(a+b)²-(a-b)²]/4
=(16-4)/4
=3
b/a+a/b
=(b²+a²)/ab
=10/3