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04-11-2019
Mathematics

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factor the following polynomial to find its roots x^2-4x-21

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Аноним Аноним

04-11-2019

Answer:

(x+3)(x−7)

Step-by-step explanation:

Break the expression into groups.

=(X^2+3x)+(-7x-21)

Factor out x from x^2+3x: x(x+3)

Factor out -7 from -7x-21: -7(x+3)

=x(x+3)-7(x+3)

Factor out common term x+3

=(x+3)(x-7)

Glad I could help!!

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