Question

Add: 2ab -5bc +2ca, ab -bc +ca, -ab +bc -ca, 6ab +7bc -3ca. please do it fast​

Answer 1

Answer:

8ab+12bc-ca

Step-by-step explanation:

▪︎convert , to addition sign +

▪︎ then add according to sign

▪︎ cancel the similar terms with different signs.

and you'll get your answer...

Answer 2

Answer:

2ab-5bc+2ca+(ab-bc+ca)+(-ab+bc-ca)+(6ab+7bc-3ca)

=2ab-5bc+2ca+ab-bc+ca-ab+bc-ca+6ab+7bc-3ca

here +ab-bc+ca-ab+bc-ca = 0 coz they are opposite signs +&-

then the remaining will be

2ab-5bc+2ca+6ab+7bc-3ca

here 2ab+6ab= 8ab

-5bc+7bc = +2bc ( -*+ = - and put the sign of the biggest number here it is 7)

+2ca-3ca = -ca same principle here but here the biggest number is 3 and it's sign is -

so the final answer is

8ab+2bc-ca