Question

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

Answer 1

`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`