Question

prove that2√3-7...i need a photo for this question..pls I have this question in my exam now​

Answer 1

To be contrary 2√3-7 is a rational number such that 2√3-7=a/b

2√3=a/b+7

2√3=a+7b/b

since a+7b/b is a rational number so 2√3must be rational number but 2√3is a irrational number

so it contradict our fact. therefore 2√3-7 is a irrational number.

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