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Identify the factors of x2 − 4x − 21. (x − 7)(x + 3) (x + 7)(x − 3) (x + 21)(x − 1) (x − 21)(x + 1)
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2 votes
Identify the factors of x2 − 4x − 21.

(x − 7)(x + 3)
(x + 7)(x − 3)
(x + 21)(x − 1)
(x − 21)(x + 1)

User Thaking
by
7.3k points

2 Answers

1 vote

Answer: the answer is A

Explanation:

(x-7)(x+3)

User FredLoh
by
7.1k points
6 votes
x^2-(7-3)x-21=0
=>x^2-7x+3x-21=0
=>x(x-7)+3(x-7)=0
=>(x+3)(x-7)=0

therefore, (x-7)(x+3) is the correct answer.
User Walter Gandarella
by
7.9k points
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