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Factoring x^2-4x-21=0

Factoring x^2-4x-21=0
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3 votes
Factoring
x^2-4x-21=0

asked
User Shehab Fawzy
by
8.0k points

1 Answer

3 votes
Find two numbers that add to -4 and that multiply to -21.

After playing around with some numbers, I got -7 and 3.

So, the factored form is (x - 7)(x + 3).
answered
User Josh Kitchens
by
8.5k points
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