Question

9m2 − 81n2

Answer 1

is that:
9m^2 − 81n^2
or just
9m2 − 81n2

Answer 2

I'm sorry I haven't used this site before and I'm quite tired now lol. I meant to put it into the search bar, I'm meant to factorise 9m2 − 81n2 I do understand the basics for example I've just finished x^2-x-42 but this blows my mind.

Answer 3

so...im guessing its squared.

Answer 4

Blank to be honest, I'm very poor at maths.

Answer 5

http://www.wolframalpha.com/input/?i=9m%5E2+%E2%88%92+81n%5E2

Answer 6

Thankyou

Answer 7

I couldn't quite make sense of that site in the end I accidentally had a ureka moment instead.

9m^2 − 81n^2=(3m+9N)(3m-9n)
Because 3^2 is 9 and 9^2 is 81 then of course 2 m's = m^2 and so on.

Thankyou for your help though.