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Factor the following expression:
x2-4x-21

User Erf
by
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1 Answer

6 votes

Answer:

(x − 7)(x + 3)

Explanation:

Step 1: You need to find out what to numbers add up to −4 and multiply −21?

−7 and 3

Step 2: Just rewrite the expression using the above and you're done!

(x − 7)(x + 3)

User Serghei Leonenco
by
7.9k points

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