Question

Find an integer $\text{'}a\text{'}$ such that (ii) $a+7=0$.

Answer 1

The sum of any integer with its additive inverse is always $0$.

The additive inverse of any integer is the integer with same numerical value and opposite sign.

$$\begin{gathered} a+7=0 \\ \Rightarrow a=-7 \end{gathered}$$

Hence the value of $\text{'}a\text{'}$ is $-7$