Question
The value of `(sqrt(80) - sqrt(112))/ (sqrt(45) - sqrt(63))` is :
Answer: Option B
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`(sqrt(80) - sqrt(112))/ (sqrt(45) - sqrt(63))` = `(sqrt(16 xx 5) - sqrt(16 xx 7))/(sqrt(9 xx 5) - sqrt(9 xx 7))`
= `(4sqrt(5) - 4sqrt(7))/(3sqrt(5) - 3sqrt(7))` = `(4(sqrt(5) - sqrt(7)))/(3(sqrt(5) - sqrt(7)))` = `4/3` = `1 1/3`
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