Answer/Discussion on Subtracting Real Numbers

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Beginning Algebra
Answer/Discussion to Practice Problems
on Subtracting Real Numbers

Answer/Discussion to 1a

-10 - (-2)

-10 - (-2) = -10 + 2 = -8.

Subtracting -2 is the same as adding 2. Once it is written as addition, we just following the rules for addition to complete.

Answer/Discussion to 1b

- 4.1 - 5.3

- 4.1 - 5.3 = - 4.1 + (-5.3) = -9.4.

Subtracting 5.3 is the same as adding -5.3. Once it is written as addition, We just following the rules for addition to complete.

Answer/Discussion to 2a

Since we have several operations going on in this problem, we will have to use the order of operations to make sure that we get the correct answer.

*Exponent
*Multiplication
*27 + (-2) = 25

Answer/Discussion to 2b

Since we have several operations going on in this problem, we will have to use the order of operations to make sure that we get the correct answer.

*Eval. inside of absolute value

*Exponent
*Multiplication

*16 - 4 = 12

Answer/Discussion to 3a

To review evaluating an expression go to Tutorial 4: Introduction to Variable Expressions and Equations.

Plugging 2 for x and -2 for y and simplifying we get:

*Plug in 2 for x and -2 for y

Answer/Discussion to 4a

If you need a review on what a solution to an equation is go to Tutorial 4: Introduction to Variable Expressions and Equations.

Replacing x with -2 we get:

*Plug in -2 for x

Is -2 a solution?

Since we got a TRUE statement (7 does in fact equal 7), then -2 is a solution to this equation.

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