Question

add ab+2bc-ca and 2ab-bc-ca and subtract 4ab+5bc-3ca

Answer 1

ab + 2bc - ca + 2ab - bc - ca - ( 4ab + 5bc - 3ca)

3ab + bc - 2ca - 4ab - 5bc + 3ca

-ab - 4bc + ca

Answer 2

{(ab+2bc-ca)+(2ab-bc-ca)}-(4ab+5bc-3ca)
{ab+2bc-ca+2ab-bc-ca}-4ab-5bc+3ca
3ab+bc-2ca-4ab-5bc+3ca
-ab-4bc+ca
ca-ab-4bc. ans