SOLUTION: Factor completly 81x^2 - 441y^2 I was able to break down the first part but had problems breaking down the 441y^2

Question 309793: Factor completly 81x^2 - 441y^2
I was able to break down the first part but had problems breaking down the 441y^2
Found 2 solutions by stanbon, palanisamy:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Factor completly 81x^2 - 441y^2
------------------
441 is 21^2
----------------------
(9x-21y)(9x+21y)
====================
Cheers,
Stan H.
Answer by palanisamy(496) (Show Source): You can put this solution on YOUR website!
81x^2-441y^2
=(9x)^2-(21y)^2
=(9x+21y)(9x-21Y)
RELATED QUESTIONS
Find the LCM of: 121x^2-9y^2 and 11x^2+3xy I've tried breaking it down but i'm not... (answered by ankor@dixie-net.com)
Factor 2x^2 + 8X + 6 I took the 2 out to make it x^2 + 4X + 3 but wasnt sure how to... (answered by Earlsdon)
Given f(x) x^4-11x^3+9x^2+109x-122 How would you use polynomial division to show that (answered by josgarithmetic)
what is the factor of 8x^2+67x-45? I cannot break it down any... (answered by stanbon,rapaljer)
sum of rational expressions. i tried breaking the question down but i get lost. THE... (answered by Fombitz,JBarnum)
I know have a problem and I dont know how to break the problem down (x^2-x-6)/(x^2-4) (answered by jim_thompson5910)
Factor the polynomial completely,clearly show the GCF. -3x^2-15x-18 I was able to... (answered by 303795)
I am looking for help on my algebra problem. Completly factor the following... (answered by stanbon)
Find all complex-number solutions 2x^2-3x-5=0 I just need to see steps on how to... (answered by josgarithmetic,MathTherapy)