Đáp án`+`Giải thích các bước giải:

`x^4 + 6x^2 - 11x^2 + 6x + 1`

`= x^4 - 5x^2 + 6x + 1`

`= ((x^2)^2 - 4x^2 + 2^2) + (x^2 + 2 . x . 3 + 3^2) - 12`

`= (x^2 - 2)^2 + (x + 3)^2 - 12`

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{\text{d}}$$\color{#53008}{\text{M}}$$\color{#6b28ac}
{\text{a}}$$\color{#8c4ebd}{\text{t}}$$\color{#B592D6}
{\text{h}}$$\color{#ceaedf}{\text{s}}$꧂