Evaluate (2\sqrt3 - 4) (2\sqrt3 + 4)
A
-4
B
-2
C
2
D
4
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
2\sqrt3 - 4) ( 2\sqrt3 + 4)
= 12 + 8\sqrt3 - 8\sqrt3 – 16
= 12 – 16
= -4
The two expressions in the bracket are conjugate of each other
Source: Myschool Past Questions Archive (Record #47565)