(a+b)^2=a^2+2ab+b^2

The product of the sum of two numbers and the difference of these two numbers is equal to the square difference of these two numbers, which is expressed in letters as

Text expression: the product of the sum of two numbers and the difference of two numbers is equal to the square of the difference of two numbers. This is the square difference formula [2]? .

Characteristics of the formula: the left side is the sum of two numbers multiplied by the difference of two numbers, that is, the right side is the product of two binomials, in which one item (a) is exactly the same and the other items (b and -b) are opposite; On the right is the square difference between these two numbers, that is, the square of the same term MINUS the square of the opposite term of the right sign.

Extended data:

Other mathematical formulas:

1, factorization: a 3 3a 2b+3ab 2 b 3 = (a b) 3.

2. arithmetic progression's general formula: an-a1+(n-1) d.

3. The sum of the top n items in arithmetic progression: sn = [n (a1+an)]/2 = na1+[n (n-1) d]/2.

4. General formula of geometric series: an = a 1 * q (n- 1)

5. Sum of the first n terms of geometric series: Sn = a1(1-q n)/(1-q) = (a1-a1q n)/(1-q n).

Baidu Encyclopedia-Square Difference Formula

Baidu Encyclopedia-Mathematical Formula