BACK TO TEXT

Check for 1.2

 

Example 3. Factor out the GCF:  

Factored Form:  

 

Check 1: The tables of values for each expression are equivalent. Though we

certainly cannot  check all possible values, the following table supports our

answer.

 

 

x

 

 

-5

-17

-17

-4

-0.0781

-0.0781

-3

-0.0014

-0.0014

-2

0.00024

0.00024

-1

0.00014

0.00014

0

6.4E-05

6.4E-05

1

3E-05

3E-05

2

1.5E-05

1.5E-05

3

8.2E-06

8.2E-06

4

4.6E-06

4.6E-06

5

2.7E-06

2.7E-06

 

 

Check 2: If we let

 

 

on our graphing calculator, we obtain graphs like the following. The graphical representations look identical. Again, this is not a proof, but these graphs do support our answer.

 

Y1

Y2