Question

The law of cosines a2+b2-2abcosC=c2. Find the value of 2abcosC.

Answer 1

2ab·cos(C) = a² +b² -c²
.. = 4² +3² -2²
.. = 16 +9 -4
.. = 21 . . . . . . . matches selection B

Answer 2

Answer:

b 21

Step-by-step explanation: