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Grade: 9

                        

What is the Rationalising factor of 5 1/3 +5 -1/3 find the rationalising factor by prrof

one year ago

Answers : (2)

Arun
25211 Points
							
Dear student
 
It can be written as 5^1/3 + 5^-1/3
rationalizing factor is ( 5^2/3 + 5 ^-2/3 – 1) as when multiplied, this convert in to the formula of a^3 + b^3
one year ago
Vikas TU
13784 Points
							
Dear student 
Here is the explanation of above question.
Your question is how to rationalize the above expression.
The above answer gives you the shortest way to rationalize the expression.
For finding rationalizing factor you can use this method. This is somewhat complex .
Take 5^1/3=a & 5^-1/3=b
Now find the lcm if the exponents.
In this case since the denominator is same therefore the LCM is 3
Now a^3=5 & b^3=5^-1
Since a and b are rational therefore a^3-b^3 is also rational
a^3-b^3=(a-b)(a^2+ab+b^2)
Rationalizing factor of a-b=(5^1/3–5^-1/3)
=5^2/3+5^–2/3+5^2/3*5^-2/3
Now just solve the above expression and get the rationalizing factor
Hope this will help 
Good Luck 
one year ago
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