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Factor 25x2-20x+4 I can't figure out what to do with 25.

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I assume you mean
25 x^2 - 20 x + 4
factors of 25
1,25
5, 5
factors of 4
1,4
2,2
well 5*2 = 10 and two of those is 20
so try
(5 x - 2)(5 x - 2)

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