Suggestions on the knowledge of square root in junior two mathematics are as follows: 1, meaning of root. People will always get to the bottom of a new thing, and so will the square root. Which number squared equals 4? Which number's square equals 9? Which number squared equals 2? So people call plus or minus 2 the square root of 4, plus or minus 3 the square root of 9 and plus or minus 2 the square root of 2. 2. The original words of rote learning are definitions (definitions are human rules, don't ask why? There is no reason to tell, only rote learning) if x? 0? 5=a, then x is called the square root of a, and it is represented by the sign plus or minus the root sign A. Notice what happens when a < 0? If x? 0? 6=a, then x is called the cube root of a, which is represented by a under symbol 3. 3, the concept must understand memory (to recite it backwards), such as: negative numbers have no square root. Positive numbers have two square roots. They are a pair of opposites. There is no symbol in front of the root sign m to indicate the arithmetic square root, which is a typical non-negative number, and so on ... 4. Do more conceptual problems of square root knowledge to firmly understand and remember. In the next stage of square root, do less questions about square root knowledge to prevent forgetting.