### Home > INT1 > Chapter 1 > Lesson 1.1.1 > Problem 1-9

1-9.

Simplify each expression.

Because both numbers are negative, you can add them. Don't forget to make the answer negative.

Subtracting a negative is the same as adding a positive. Think of this as

.

Because there is only one negative number, the final answer will be negative. Multiply the numbers.

The rules for division are the same as the rules for multiplication.

Multiplying two negatives makes a positive.

So

Multiplying a positive and a negative makes a negative.

Subtraction is like adding a negative. Refer to part (a) to see the process.

Because the exponent is outside the parentheses, think of this as

.

Think of this as

which is.

What positive number multiplied by itself is

?