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Mathematics 7 Online
OpenStudy (anonymous):

x^2-4x-21

OpenStudy (anonymous):

@JungHyunRan

OpenStudy (anonymous):

\(x^2-4x-21=x^2+3x-7x-21=(x^2+3x)-(7x+21)\\=x(x+3)-7(x+3)=(x-7)(x+3)\)

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