Question

what is the factor of a²+ab+bc+ca?

Answer 1

Answer:

(a+c) times (a+b)

Step-by-step :

Since there is an a^2 there will be two a's in both of the factorizations. Since there is no negative in the equation you can assume that there is no negative in the whole binomial. Then it is just a matter of guessing and checking.