Question

Find the rational number and b such that
2+5√7 is divided by 2-5√7 = a+√7b

Answer 1

2+5

7

onrationalising:

=>

2−5

7

2+5

7

×

2+5

7

2+5

7

=>

4−175

4+175+20

7

=>

−171

179+20

7

Answer 2

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