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teachoo.com
Example 19 - Rationalise the denominator of 1/(7+3 root 2)
Example 19 Rationalize the denominator of 1/(7 3√2 ). 1/(7 3√2 ) = 1/(7 3√2) × (𝟕 − 𝟑√𝟐)/(𝟕 − 𝟑√𝟐) = (7 − 3√2)/(7 3√2)(7 − 3√2) = (7 − 3√2)/((𝟕)^𝟐 − (𝟑√𝟐)^𝟐 ) = (7 − 3√2)/(49 − (3 × 3 × √2 × √2) ) = (7 − 3√2)/(49 − (9 × 2) ) ( As (a b)(a – b) = a2 – b2 ...
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