Question

please give me his answer fast​

Answer 1

Answer:

8a - 2ab + 2b - 15 and ab + bc + ac

Step-by-step explanation:

i) Subtract 4a - 7ab + 3b + 12 from 12a - 9ab + 5b - 3

=> 12a - 9ab + 5b - 3

- ( 4a - 7ab + 3b + 12 )

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Change + into - and - into +

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8a - 2ab + 2b - 15

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Note : Put the sign of greater digit

ii ) Add :

= a - b + ab + b - c + bc + c - a + ac

= a- a - b + b + c - c + ab + bc + ac

= ab + bc + ac