itzjustbri itzjustbri

15-08-2019
Mathematics

contestada

What’s [(x-y) + 7] times [(x-y) - 7]?

Respuesta :

jcherry99 jcherry99

15-08-2019

Answer:

Step-by-step explanation:

Let z = x - y

The given expression translates into

(z + 7)(z - 7) which is going to give you the difference of squares.

z^2 - 49

Now you need to know what z^2 is

z = x -y

z^2 = x^2 - 2xy + y^2

So the answer becomes

x^2 - 2xy + y^2 - 49

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