check whether X + 3 is a factor of the px x square - 9
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px=xsquare-9
find zero of x+3
0=x+3
-3=x
put in px
-3square -9
9-9
0 therefore x+3is a factor of px
find zero of x+3
0=x+3
-3=x
put in px
-3square -9
9-9
0 therefore x+3is a factor of px
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