How do you write #(x-4)(x+4) # in standard form?

1 Answer
Mar 4, 2018

Answer:

#x^2-16#

Explanation:

If your looking to expand these out:

In mathematics, theres a well known rule in algebra called the difference in two squares, what should be committed to memory and understood how to apply:

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

This can be proved via simply expanding out

Applying this rule:

#a = x , b = 4 #

#=> a^2 - b^2 = (x)^2 - 4^2 #

#=> x^2 - 16 #