Question

(a+b)(2a+b)+(3a+2b)(a+b)-(a+b)(a+4b).Please explain me this question.

Answer 1

a variable is known as 1 so a+b is 2so 2a+b is 3 2a is 2 itself because with the variable if number is there only the number has the value

Answer 2

I also don't understand your question