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Question
If `sqrt(2) = 1.414, sqrt(3) = 1.732`, then find the value of `4/(3sqrt(3) - 2sqrt(2)) + 3/(3sqrt(3) + 2sqrt(2))`.
Solution
We have, `4/(3sqrt(3) - 2sqrt(2)) + 3/(3sqrt(3) + 2sqrt(2))`
= `(4(3sqrt(3) + 2sqrt(2)) + 3(3sqrt(3) - 2sqrt(2)))/((3sqrt(3) - 2sqrt(2))(3sqrt(3) + 2sqrt(2))`
= `(12sqrt(3) + 8sqrt(2) + 9sqrt(3) - 6sqrt(2))/((3sqrt(3))^2 - (2sqrt(2))^2` ...[Using identity, (a + b)(a – b) = a2 – b2]
= `(21sqrt(3) + 2sqrt(2))/(27 - 8)`
= `(21sqrt(3) + 2sqrt(2))/19`
= `(21 xx 1.732 + 2 xx 1.414)/19` ...`["Put" sqrt(2) = 1.414 "and" sqrt(3) = 1.732]`
= `(36.372 + 2.828)/19`
= `39.2/19`
= 2.06316
= 2.063
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