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Factor Using the Ac-Method $21 - 10 x + x ^ { 2 }$

Question 31

Multiple Choice

Factor using the ac-method.
- $21 - 10 x + x ^ { 2 }$

A) $( x + 3 ) ( x - 7 )$
B) $( x + 3 ) ( x + 7 )$
C) $( x - 3 ) ( x - 7 )$
D) $( x - 3 ) ( x + 7 )$

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