Find the sum:
a) 2ab +3bc, 5ac - 5ba, 2cb + 5ab
b) a + b + c, 2b - c,3c + a
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a)
2ab +3bc + 5ac - 5ba + 2cb + 5ab
⇒ 2ab + 5ab -5ab +3bc + 2cb + 5ac
⇒ 2ab + 5bc + 5ac
b)
a + b + c + 2b - c + 3c + a
⇒ a + a + b + 2b - c + 3c
⇒ 2a + 3b + 2c
2ab +3bc + 5ac - 5ba + 2cb + 5ab
⇒ 2ab + 5ab -5ab +3bc + 2cb + 5ac
⇒ 2ab + 5bc + 5ac
b)
a + b + c + 2b - c + 3c + a
⇒ a + a + b + 2b - c + 3c
⇒ 2a + 3b + 2c
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