開方根(粵拼:hoi1 fong1 gan1),簡稱開方,又叫平方根,可以話係平方嘅相反。如果 y 係非負實數( y ≥ 0 ), y 2 = x =x} ,噉 x }} 就係 y ,正開方根可以用√表示。
一個數嘅平方根有兩個,例如 而 ,所以 嘅平方根有 同 ,分別寫做 同埋 。
對於所有實數 :
對於正數 ,有以下嘅公式:
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