*<mathA</math> and <math>B</math> can be positive or negative. Suppose <mathA</math> and <math>B</math> are of same sign either '+' or '-',then the resultant sign is also the same. | *<mathA</math> and <math>B</math> can be positive or negative. Suppose <mathA</math> and <math>B</math> are of same sign either '+' or '-',then the resultant sign is also the same. |