# Find the additive inverse of 10\begin{align} & \text{a) 0} \\ & \text{b) -10} \\ & \text{c) 8} \\ & \text{d) None of these} \\ \end{align}

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Hint: Now the additive inverse of any number is the negative of that number. Hence additive inverse of +a where a is any number is equal to –a. Similarly additive inverse of –a where a is any number is +a.

Now let us try to understand what additive inverse is. Before understanding additive inverse we should know what is additive identity. Additive identity is a number which upon adding to any number will give the same number.
i.e. a + additive identity = a, where a is any number.
Now for every real number additive identity is 0 since for any real number a, a + 0 = a.
Now additive inverse of any number is a number which upon adding to the number gives additive identity.
Additive inverse and Multiplicative inverse are two different concepts. Additive identity is 0 since a + 0 = a, while multiplicative identity is 1. Since $a\times 1=a$
Similarly additive inverse of a is –a since a + (-a) = 0, whereas multiplicative inverse of a is $\dfrac{1}{a}$ as $a\times \dfrac{1}{a}=1$ .