If a and B are reciprocal and C and D are opposite, find 2C + 2d-3ab

If a and B are reciprocal and C and D are opposite, find 2C + 2d-3ab

A. If B is reciprocal to each other, then a * b = 1
C. If D is opposite to each other, then c + D = 0
2c+2d-3ab
=2(c+d)-3a*b
=2*0-3*1
=0-3
=-3