3 years ago

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

Mathematics

1 answer:

adoni [48]3 years ago

5 0

Answer: 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

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