Calculation (a + 1) (a + 2) (a + 3) (a-6)

Calculation (a + 1) (a + 2) (a + 3) (a-6)

(a+1)(a+2)(a+3)(a-6)
=[(a+1)(a-6)] [(a+2)(a+3)]
=(a²-5a-6)(a²+5a+6)
=(a²)²-(5a+6)²
=a^4-25a²-60a-36
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