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7 and -3 are the roots of the quadratic equation x^2+kx-21=0 what is the value of k

User Hozeis
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1 Answer

3 votes

Answer:

-4

Explanation:

The roots are 7 and -3, so the factored version is (x - 7) (x + 3)

Foil them and you get x^2 - 4x - 21

User Jieren
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