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  1. If x2 +
    1
    		 = 66 , then the value of
    x2 - 1 + 2x
    		 = ?
    x2x

    1. ± 8
    2. 10, – 6
    3. 6, –10
    4. ± 4
Correct Option: B

Using Rule 5

x2 +
1
 = 66
x2

⇒ x -
1
2 + 2 = 66
x

⇒ x -
1
2 = 66 - 2 = 64
x

⇒ x -
1
 = ± 8
x

∴ Expression =
x2 - 1 + 2x
x

Expression =
x2
-
1
 + 2 = x -
1
 + 2
xxx

Putting the value of x -
1
 = 8 + 2 or – 8 + 2 = 10 or –6
x


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