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