Which of the following expressions CANNOT have a negative value Answers:	A) |a + b| – |a – b|	B) |a + b| – |a|	C) a^2 + b^2	D) |2a + b| – |a + b|	E) |a^3 + b^3| – a – b
Whenever you are required to find if the equation is a perfect square or not, try to bring everything in the form of a perfect square as they are always positive.   Of the given options, only option D can be written in from of a perfect square.   a^2+b^2   This will always be positive.   a^2 + b^2orrect Option: a^2 + b^2
<result>C</result>
Which of the following expressions CANNOT have a negative value