Rationalise 5 / 7 + 4 √ 5
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Answer:
35 - 20√5 / -31
Step-by-step explanation:
5/7+4√5
= 5(7-4√5)/(7+4√5)(7-4√5)
= 35 - 20√5/7² - (4√5)²
= 35 - 20√5/49 - 80
= 35 - 20√5/-31
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