Numbers and

Question

if (a+b)>0 and (a+b)^1/2 >0 which one of the following must be true? 

a. a>0

b. b>0 

c. a<0

d. b<0

Answer 1

(a + b)^1/2 > 0

(a + b) > 0        square both sides

 

This expression is the same as the first.

No conclusion as the values of a or b is possible.