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  1. If   a2 + + 1 = 9a, (a ≠ 0) then the value of (a)2 +
    1
    		 is
    (a)2
    1. 81
    2. 18
    3. 79
    4. 83
Correct Option: C

a2 + 1 = 9a

⇒ 
a2 + 1
 = 9
a

⇒  a +
1
 = 9
a

On squaring both sides,
a2 +
1
 + 2 = 81
a2

⇒  a2 +
1
 = 81 – 2 = 79
a2


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