Question

Factor the Following Polynomials:
x²-81
x^2-9^2=(x+9)(x-9)

x²-13x+36
you can get 36 by 4 and 9
(x-9)(x-4)
Which polynomial is a special product and why?

Answer 1

i did the factoring i just need to know which oe is a special product

Answer 2

First one....

Answer 3

why

Answer 4

which is a difference of squares

Answer 5

In general

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

Answer 6

See, do this:

(a + b)*(a -b)

Here middle terms get cancel and we left with a^2 - b^2..
So, it is the special case...