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Check for 1.2

 

Example 1.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

-2205

-2205

-4

-1368

-1368

-3

-775

-775

-2

-384

-384

-1

-153

-153

0

-40

-40

1

-3

-3

2

0

0

3

11

11

4

72

72

5

225

225

 

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