3 Title

Beginning Algebra
Tutorial 6: 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.

 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

 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

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

 *Plug in 2 for x and -2 for y

 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.

Last revised on July 24, 2011 by Kim Seward.