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Check for 1.2

 

Example 2. 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

-56950

-56950

-4

-34440

-34440

-3

-18720

-18720

-2

-8602

-8602

-1

-2898

-2898

0

-420

-420

1

20

20

2

-390

-390

3

-462

-462

4

992

992

5

5160

5160

 

 

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.

 

 

 

 

Y2

Y1