Question

(a+b)5+9a+3b. 13(a-b)-7b+4a. 6(x+a)-5a.

Answer 1

(a+b)5+9a+3b=5a+5b+9a+3b=14a+8b
13(a-b)-7b+4a=13a-13b-7b+4a=17a-20b
6(x+a)-5a=6x-6a-5a=6x-11a