(a²+4a-2)²-(a²-5a+4)²
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Step-by-step explanation:
(a²+4a-2)²-(a²-5a+4)²
=((a²+4a-2)+(a²-5a+4))((a²+4a-2)-(a²-5a+4))
=(a²+4a-2+a²-5a+4)(a²+4a-2-a²-5a-4)
=(2a^2-a+2)(-a-6)
=-2a^3-12a^2+a^2+6a-2a-12
=-2a^3-11a^2+4a-12
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