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Mathematics
OpenStudy (anonymous):

HELP, struggling and not understanding. Please and thank you! ツ What are the factored forms of the following expressions?: 1.) d^2+18d+81 -(d+9)(d-9) -(d+9)^2 -(d-81)(d-1) -(d-9)^2 2.) d^2-22d+121 -(d+11)^2 -(d-11)^2 -(d-11)(d+11) -(d-121)(d-1) 3.) r^2-49 -(r-7)(r+7) -(r+7)(r+7) -(r-7)(r-7) -(r-7)(r+9) 4.) k^2-81h^2 -(k-9h^2)(k+9) -(k+9h)(k+9h) -h^2(k+9)(k-9) -(k+9h)(k-9h) 5.) 25x^2+40x+16 -(5x+4)^2 -(5x-4)^2 -(5x+4)(5x-4) -(25x+4)(x+4)

OpenStudy (anonymous):

Even if it's just helping me on one problem so I understand a little more. That would be greatly appreciated! :)

OpenStudy (cggurumanjunath):

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