Thread: unfamiliar symbols

For all numbers a and b, let be defined by . For all numbers x, y, and z, which of the following must be true?

I.
II.
III.

• A. I only
• B. II only
• C. III only
• D. I and II only
• E. I, II, and III

Originally Posted by aeroflix

For all numbers a and b, let be defined by . For all numbers x, y, and z, which of the following must be true?

I.
II.
III.

• A. I only
• B. II only
• C. III only
• D. I and II only
• E. I, II, and III

you just have to convert each side of the equation to see if it's true ...





since for all real numbers, statement I is true.

now check the other two ...