ILL GIVE BRAINLIEST Find the solution to each problem about areas!!!

for 21: a² - b²

Step-by-step explanation:

1. you multiply (a + b) ( a - b)

first you multiply a times a, gives you a²

multiply a times negative b, gives you -ab

multiply b times a, gives you ab

multiply b times b, gives you b²

you have -ab and ab, they will cancel out leaving you with

= a²-b²

is there any photos or whatever?

sorry

step-by-step explanation:

sorry, but im pretty sure its a now that i look at it