Question

(x+2)(x-2)

Answer 1

Use factoring

Answer 2

use the difference between two squares property.the answer is xsqrd-4

Answer 3

\[\left( a+b \right)\left( a-b \right)=a ^{2}-b ^{2}\]

Answer 4

So the formula is like

(x+a)(x+b)

x^2+bx+ax+ab
x^2+(ab)^2