Question

math answers in short.

1} add ab-bc into bc-ca
2} subtract (3x²- 2x+5xy - 7) form (8- 9xy 3x²- 5x)
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Answer 1

Step-by-step explanation:

1} ab−bc,bc−ca,ca−ab

  Adding we get,

  ab−bc+bc−ca+ca−ab

   =0

2} pls see in the picture

and is that was helpful then pls mark me brainliest