Multiplication of two numbers equals to the square of what number minus the square of what number How to change the multiplication of two numbers into "the square of one number" minus "the square of another number" For example: 28x12 equals the square of "what number" -- the square of "what number"

Multiplication of two numbers equals to the square of what number minus the square of what number How to change the multiplication of two numbers into "the square of one number" minus "the square of another number" For example: 28x12 equals the square of "what number" -- the square of "what number"

You put a & sup2; - B & sup2; = (a + b) * (a-b)
A + B in is replaced by X, A-B is replaced by y
Is it [(a + b) / 2] & sup2; - [(a-b) / 2] & sup2; = AB
In other words, ab = [(a + b) / 2] & sup2; - [(a-b) / 2] & sup2;

Square of cross multiplication a-4a-2

This problem can't use cross multiplication, can use with method
The square of a-4a-2
=Square of a-4a + 4-4-2
=（a-2)²-6
=(a-2+√6)(a-2-√6)

7x7 is the multiplication of seven sevens

Wrong
7x7 is the multiplication of two 7S