1.

If 5a-15a +5=0, then a²+1/a²=​

Answer»

Step-by-step EXPLANATION:

a−1a=5

(a+1a)2=a2+2+1a2=a2−2+1a2+4=(a−1a)2+4=52+4=29

a+1a=±29−−√

a2−1a2=(a+1a)(a−1a)=±29−−√⋅5

a2−1a2=±529−−√



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