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Q=(a+5)(a+4)(a²-9)(a-2)(a-1)
a²-9=-2a
Q=(a+5)(a+4)(-2a)(a-2)(a-1)
Q=(a²+4a+5a+20)(-2a)(a²-a-2a+2)
Q=(a²+9a+20)(-2a)(a²-3a+2)
a²=9-2a
Q=(9-2a+9a+20)(-2a)(9-2a-3a+2)
Q=(7a+29)(-2a)(-5a+11)
Q=(-14a²-58a)(-5a+11)
a²=9-2a
Q=(-14(9-2a)-58a)(-5a+11)
Q=(-30a-126)(-5a+11)
Q=150a²+630a-330a-1386
Q=150a²+300a-1386
a²=9-2a
Q=150(9-2a)+300a-1386
Q=1350-300a+300a-1386
Q=1350-1386
Q=-36 //R