1
Question
The rationalising factor of 4 square root 5 .
Option
A. Square root 5
B. 3 square root 5
C. 4 square root 125
The rationalising factor of 4 square root 5 .
Option
A. Square root 5
B. 3 square root 5
C. 4 square root 125
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Solution
Answer is root 5.
because
when
( 4 root 5 × root 5 )/ root 5
= (4 ×5) / root 5
= 20/ root 5
because
when
( 4 root 5 × root 5 )/ root 5
= (4 ×5) / root 5
= 20/ root 5
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