求-2x²-8x+2的最大值.
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求-2x²-8x+2的最大值.
求-2x²-8x+2的最大值.
求-2x²-8x+2的最大值.
答:
-2x²-8x+2
=-2(x²+4x+4)+8+2
=-2(x+2)²+10
<=0+10
=10
当x+2=0即x=-2时取得最大值10
当x=-2时
最大值为:-2x4+8x2+2=10