Find a and b if [(7+√5)/(7-√5)]-[(7-√5)/(7+√5)]=a+7√5b
Answers
Answered by
4
Answer:
Well, first you need to simplify your expression.
How ?
Simple! By rationalising.
(7+√5)/(7-√5) - (7-√5)/7+√5)
Rationalise both the terms
(7+√5)² - (7-√5)²/ 49 - 5
= 49 + 14√5 + 5 - 49 + 14√5 - 5/ 44
= 28√5/44
= 7√5/11
Now, 7√5/11 = a + (7/11) √5b
On comparison,
a = 0
b = 1
Step-by-step explanation:
Answered by
3
Answer:
Step-by-step explanation:
Attachments:
Similar questions