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If a^2-7a-1=0 and a≠0;Find: i)a- 1/aii) a^2 - 1/a^2iii) a + 1/a |
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Answer» a^−4a−1=0 ⇒aa2−1=4⇒a−a1=4 Now, a2+3a+a21=a3 =a2+a21+3(a−a1)=(a−a1)2+2+3(a−a1) =42+2+3×4=30. |
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