Find the multipacative inverse of the number

-18

(-18)(?) = 1 ?

18?

no, (-18)(18) would be - 324 , not 1

what about (-18)(-1/18) ?

To find the multiplicative inverse of a number, you need to find another number that, when multiplied by the original number, equals 1.

In this case, we want to find the multiplicative inverse of -18. Let's call the multiplicative inverse x.

So, we have:
-18 * x = 1

To solve for x, we need to isolate it on one side of the equation.

Dividing both sides of the equation by -18, we get:
x = 1 / -18

Simplifying the right side of the equation, we have:
x = -1/18

Therefore, the multiplicative inverse of -18 is -1/18.

You can verify this by multiplying -18 by -1/18. The result would be 1.