Question

Add the following:
(1) a - b + ab, b - c + bc, c - a + ac
(2) 2lm + 2mn, -7lm + 2nl

Answer 1

a-b+ab+b-c+bc+c-a+ac
(a-a) +(b-b)+(c-c) +ab+bc +ac
ab+bc+ac
2)
2lm+2mn-7lm+2nl
-5lm+2mn+2nl

Answer 2

Heya!!
Here is your answer:-
(1)
We have to add :-
a-b+ab,b-c+bc,c-a+ac
First we will write down the like terms with their respective signs.
a-a-b+b-c+c+ab+bc+ac
=> a,b,c will be cancelled out.
=> We would we left up with:-
ab+bc+ac(Ans)
(2)
Here , We have to find out the sum of :-
2lm+2mn,-7lm+2nl
=>First we will search for like terms and bring them together at one side with their respective signs.
2lm-7lm+2mn+2nl
-5lm+2mn+2nl
=>We are finally left up with :-
-5lm+2mn+2nl(Ans)

Hope it helps you