Q115Short answer
What should be added to 4c (– a + b + c) to obtain 3a (a + b + c) – 2b (a – b + c)?
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3a2 + ab + 7ac + 2b2 – 6bc – 4c 2
What should be added to 4c (– a + b + c) to obtain 3a (a + b + c) – 2b (a – b + c)?
3a2 + ab + 7ac + 2b2 – 6bc – 4c 2