If 3- 3x-1 = 18, then the value of xx is :

C. 27

If (x - 1/x) = 1/2 , then (4x2 + 4/x2) is equal to :

C. 9

If $x + y = 7$ and xy = 12,
the value of $(x^2 + y^2)$ is :

A. 25

One of the factors of 3x3 + x2 - 12x - 4 is :

D. 3X + 1

If the sum of the roots of the equation $x^2 + 8x + 2 - k = 0$ is twice the product of the roots.
Then find k.

D. 6
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