SOLUTION: factor completely 9x^2+12xy+4y^2-16z^2

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Question 761963: factor completely 9x^2+12xy+4y^2-16z^2
Answer by ramkikk66(644) About Me  (Show Source):
You can put this solution on YOUR website!
Expression is: 9x^2+12xy+4y^2-16z^2
(Using the identity (a+b)^2 = a^2 + 2ab + b^2
9%2Ax%5E2%2B12%2Ax%2Ay%2B4%2Ay%5E2-16%2Az%5E2+=+%283%2Ax%2B2%2Ay%29%5E2+-+16%2Az%5E2
Now using the identity (a^2 - b^2) = (a+b)(a-b)
=%283%2Ax%2B2%2Ay%2B4%2Az%29%2A%283%2Ax%2B2%2Ay-4%2Az%29

:)