Question: Give the reason justifying each of the numbered steps in the following proof of the triangle inequality. |a + b = (a + b) 29

Give the reason justifying each of the numbered steps in the following proof of the triangle inequality.|a + b = (a + b) 29 + 9pr + D

|a + b = (a + b) 29 + 9pr + D = a + 2ab + b z|9| + |9||1|2 + z|P| = = (a + b) = |9| + |p| = |a + p | (1) (2) (3) (4)

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