If 7+√5/7-√5- 7-√5/7+√5=a +7/11√5b
Answers
Answered by
13
Step-by-step explanation:
1
rishab260
rishab260
22.05.2016
Math
Secondary School
+5 pts
Answered
Please explain
if (7+√5)/(7-√5) - (7-√5)/(7+√5) = a+(7/11)√5b find value of a and b
1
SEE ANSWER
Log in to add comment
Answers
Me · Beginner
Know the answer? Add it here!
THE BRAINLIEST ANSWER!
Divyankasc
Divyankasc Ace
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
Similar questions