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Anonymous
49v2 + 9 - 42v = 49v2 - 21v - 21v + 9 = 7v(7v - 3) - 3(7v - 3) = (7v - 3)2
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(7v - 3)(7v - 3)
10a * (a + 2)
5x(7xy + 6x + 8)
8878
Factor completely and check mentally 10a^2+20a
-5x(3x - 1)