-4а³*(2а²+а-2)+8а^5=-8а^5-4а⁴+8а³+8а^5=-4а⁴+8а³;
а=2;
-4*2⁴+8*2³=-4*16+8*8=-64+64=0.
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-4а³*(2а²+а-2)+8а^5=-8а^5-4а⁴+8а³+8а^5=-4а⁴+8а³;
а=2;
-4*2⁴+8*2³=-4*16+8*8=-64+64=0.