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18) If a=-1...,5, and the value of a un3+ √5, find the value of a +1 |
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Answer» a^2=(3+ V3/2)^2=(9+3/4)=(12/4)=3, 1/a^2=1/3; 3+1/3=10/3=a^2+1/a^2 a=3+V5/2= a^2=(3+V5/2)^2=(3+5/4) =8/4=2 1/a ^2= (2/3+V5)^2=1/2 a^2+1/a^2=2/2=1 a2+1/a2=7 this is the correct answer |
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