Find the sum of the following using column method : a) 9ab + 4bc –7cd, 2bc + 2cd – 3ab + 9 , -3cd + 2ab -5bc, -8ab – cd – bc – 5
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Answer:
9ab+4bc-7cd+2bc+2cd-3ab+9+(-3cd) + 2ab-5bc+(-8ab)-cd-bc-5
Step-by-step explanation:
=9ab-3ab+2ab-8ab+4bc+2bc-5bc-bc-7cd+2cd-3cd-cd+9-5
=6ab-6ab+6bc-6bc-5cd-4cd+4
=0+0-9cd+4
=-9cd+4answer
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