Show that (x + 4)(x + 5)(x + 6) can be written in the form ax3 + bx2 + cx + d where a, b, c and d are positive integers.
=(x+4)(x2+6x+5x+30)=(x+4)(x2+11x+30)=x3+11x2+30x+4x2+44x+120=x3+15x2+74x+120
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