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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The Answer of 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

Factor Completely the Polynomial