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= x³ + 15a² + 75x + 125
=(×+5)(×+5)(×+5)
=(×^2+5×+5×+25)(×+5)
=×^3+5×^2+25×^2+25×+25×^2+25×+25×+125
=×^3 + 55×^2 + 75× + 125