Evaluate (2√3 – 4) (2√3 + 4)
-
-4
- -2
- 2
- 4
The correct answer is: A
Explanation
2√3 - 4) ( 2√3 + 4)
= 12 + 8√3 - 8√3 – 16
= 12 – 16
= -4
The two expressions in the bracket are conjugate of each other
There is an explanation video available .