Question
Given `sqrt(2) `= 1.414. The value of `sqrt(8) + 2sqrt(32) - 3sqrt(128) + 4sqrt(50)` is :
Answer: Option B
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Given exp. = `sqrt(8) + 2sqrt(32) - 3sqrt(128) + 4sqrt(50)`
= `sqrt(4 xx 2) + 2sqrt(16 xx 2) - 3sqrt(64 xx 2) + 4sqrt(25 xx 2)`
= `2sqrt(2) + 8sqrt(2) - 24sqrt(2) + 20sqrt(2)` = `6sqrt(2)` = 6 x 1.414 = 8.484.
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