Question

factor:
a^2 - 18ab + 81b^2
and
36x^2 - 25y^2

Answer 1

second one
(6x-5y)(6x+5y)

Answer 2

(a-9b)^2

Answer 3

how did you factor the first one?

Answer 4

Probably from the appearancer. The first and last term are perfect squares, then a check of the middle term revealed that it was the sum of the negative root (-9 + -9)

Answer 5

thanks!

Answer 6

I used recognition.

Answer 7

There u go ifg, by inspection!

Answer 8

(a-b)(a-b) or (a-b)^2 is equal to a^2-2ab+b^2

Answer 9

Trust me, it will get easier as time goes on.