Question 382975
Just not getting this, please help???

Find the product: (4x-5y)(4x+5y)


these are 2 binomials (polynomials with 2 terms)
use FOIL (First Outer Inner Last)
(4x - 5y)(4x + 5y)
16x^2 + 4*5*x*y - 4*5*x*y - 25y^2
16x^2 - 25y^2, this is also a difference of squares