Square of (x + 6x) + 18 (x + 6x) + 81 How to factorize

（x²+6x）²+18（x²+6x）+81
=((X & # 178; + 6x) + 9) &# 178; (Note: this step is to take (X & # 178; + 6x) as a whole, which is exactly a complete square expansion)
=（x²+6x+9）²
=（（x+3）²）²
=（x+3）^4

RELATED INFORMATIONS

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16. Y & # 178; + 4Y + 8 = y & # 178; + 4Y + 4 + 4 = (y + 2) & # 178; + 4 ≥ 4, so the minimum value of Y & # 178; + 4Y + 8 is the minimum value of M & # 178; + m + 4
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