According to the given data we have the following expression:
bc = (2a)
a=4
b=4
c=-2
To evaluate and calculate the expression when bc = (2a) we would have to substitute the elements of the expression with the values provided above.
So, the expression would be replaced by the values of the elements as follows:
bc = (2a)
4*.-2=-(2*4)
-8=-8
The expression is valid as -8 is equal to -8.