Factorize `x^2-4x-21`.

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Factorize x^4-3x^2+2 .

Factorize: 21 x^2-2x+1/(21)

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Factorize: 4x^2-36 .

Factorize :(x^(2)-4x)(x^(2)-4x-1)-20

Factorize : (x^2-4x)(x^2-4x-1)-20

Fill in the box to factorize: 3x^2 +4x -4

Factorize: 21x^(2)-2x+(1)/(21)