ashleybarrera2000 ashleybarrera2000

08-02-2019
Mathematics

contestada

how is a²-4a-21 expressed in factored form?

(x-1)(x+21)
(x-21)(x+1)
(a-7)(a+3)
(a-3)(a+7)

Respuesta :

grujan50 grujan50

08-02-2019

Answer:

The correct answer is: (a-7) (a+3)

Step-by-step explanation:

a² - 4a - 21 = (a² - 7a) + (3a - 21) = a (a - 7) + 3 (a - 7) = (a - 7) (a + 3)

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