1 . I f o n e f a c t o r o f 2 a 4 + 5 a 3 − 5 a + 2 i s ( a − 1 ) , w h
- A. 2 a 2 − a + 2
- B. 2 a 2 − a − 2
- C. a-2
- D. a 2 − 1
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