(a*a+5a+3)(a*a+5a-2)-6因试分解

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(a*a+5a+3)(a*a+5a-2)-6因试分解(a*a+5a+3)(a*a+5a-2)-6因试分解(a*a+5a+3)(a*a+5a-2)-6因试分解设a*a+5a=k原式=(k+3)(k-2)

(a*a+5a+3)(a*a+5a-2)-6因试分解
(a*a+5a+3)(a*a+5a-2)-6
因试分解

(a*a+5a+3)(a*a+5a-2)-6因试分解
设a*a+5a=k
原式=(k+3)(k-2)-6
=k*k+k-6-6
=k*k+k-12
=(k+4)(k-3)
=(a*a+5a+4)(a*a+5a-3)
=(a+1)(a+4)(a*a+5a-3)