Factor Completely the Polynomial

question 15

Multiple Choice

Factor completely the polynomial. Indicate any that are not factorable using integers. a ² - 4 a + 21

• A)( a - 3)( a + 7)
• B)( a + 3)( a - 7)
• C)( a - 3)( a - 7)
• D)( a + 3)( a + 7)
• E)not factorable

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