x2-3x-504 split the middle term
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you will get answer from the above picture
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X2-3x-504
=x2-21x+24x-504
=x (x-21)+24 (x-21)
=(x-21)(x+24)
=x2-21x+24x-504
=x (x-21)+24 (x-21)
=(x-21)(x+24)
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