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Mathematics 7 Online
OpenStudy (anonymous):

Factor 9c^2-100f^2

OpenStudy (hoblos):

use the difference of two squares formula a^2 - b^2 = (a-b)(a+b)

OpenStudy (hoblos):

here 9c^2-100f^2 = (3c)^2 - (10f)^2 = (3c-10f)(3c+10f)

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