Factorise y^2 + 3x - 504
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y^2+24y-21y-504=y*(y+24)-21*(y+24)=(y+24)*(y-21)
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y²+3y-504
y²+24y-21y-504
y(y+24)-21(y+24)
(y-21)(y+24)
y²+24y-21y-504
y(y+24)-21(y+24)
(y-21)(y+24)
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