10a (x - y) & # 178; - 5a (y - x)

10a (x - y) & # 178; - 5a (y - x)

10a (x - y) & # 178; - 5a (y - x)
= 10a (x - y) & # 178; + 5a (x - y)
= 5a (x - y) [2 (x - y) + 1]