What is the value of the following expression?

(-81) (-9)

A) - 90

B) - 9

D) 9

D) 90

The expression (-81) (-9) will give the value of 729.

Step-by-step explanation:

The given expression is (-81) (-9).

The both numbers in the expression are negative numbers and they are given inside the brackets.

This means that, the negative numbers must be multiplied to get a final value.

The rules in multiplication are:

Positive number * Positive number = positive number Negative number * Positive number = negative number Positive number * Negative number = negative number Negative number * Negative number = positive number

From the rules, it can be determined that the result of any two negative numbers will be a positive number.

So, eliminate option A) and B) because they have negative sign.

The expression (-81) (-9) = - 81 * - 9

⇒ 729.

Therefore, the option C) and D) are not in match with 729. None of the options are not the value of the given expression (-81) (-9).