Write out a linear equation of one variable with x = - 2 as the solution and the coefficient of the unknown is 1 / 3
1/3X+2/3=0
Square difference formula (a + b) (B-A)
Is the square of a - the square of B
still
Square of B - square of a
Why?
Just give it a try
It's B ^ 2-A ^ 2
The same symbol is in front
What's different is in the back
Or just as it is
(B+A)(B-A)
What can a and B represent in the square difference formula?
Can represent all real numbers