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Tìm f(x) biết 2f(x)+8x2−2x=x4+2x2−32x+2" role="presentation" style="box-sizing: border-box; outline: none; display: inline-block; line-height: 0; text-align: left; overflow-wrap: normal; word-spacing: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">√2f(x)+√8x2−2x=x4+√2x2−√32x+2