The square of a means a×a, abbreviated as a? It can also be written as a× a (a (the first power of a× the first power of a = the second power of a), for example, 4×4= 16, 8×8=64, and the square symbol is 2. That is, the square of 2 is 4, which is equal to 2×2=4.

The square of the side length (that is, the side length × the side length) = the area of the square. Square is also called quadratic, and the inverse operation of square is square root. The square root is written as √, for example = 1.7320 ... exactly the square of 1.7320 ... is 3. It is called the arithmetic square root, for example = 1.7320.

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The square difference formula is a mathematical formula, which belongs to multiplication formula, factorization and identity, and is widely used. Square difference refers to the multiplication formula obtained by subtracting another square number or square from one square number or square: a? -B? =(a+b)(a-b).

Square sum formula:, that is?

Square difference can be verified by factorization and distribution law. Let's start with a and B.

Ba-ab=0, that is, ab=ba, using the principle of ring. Substitute this formula into:

If the above formula holds, the following formula is obtained:

Using the above r-r=0, that is, the two sides are equal, we get:

Note: a2-ab+ba-b2=(a-b)(a+b)