Factor the following expression: x2-4x-21

1 answer:

3 0

Answer:

(x − 7)(x + 3)

Step-by-step 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)

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