Question

What is the multiplicative inverse of $a-\frac{1}{2}$ ?

• A. $a+\frac{1}{a}$
• B. $\frac{1}{a}-a$
• C. $\frac{a}{a-1}$
• D. $\frac{a}{a^2-1}$

Answer 1

Answer: (D)

If $ab=1$, then $a$ is multiplicative inverse of $b$, and vice versa.