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

asked Jul 15, 2023 119k views

11 votes

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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

Jieren answered Jul 19, 2023

8.6k points

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