25x-75y+25 = 25(x-3y+1)
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4r2-25 = (2r)2-52 = (2r-5)(2r+5)
The greatest common factor of 16 and 25 is 1. This is because 1 is the largest integer that divides both 16 and 25 without leaving a remainder. 16 can be factored into 2^4 and 25 can be factored into 5^2, and since they do not share any common factors other than 1, the greatest common factor is 1.
32 plus 25 is 57.
4x2+20x+25 (2x+5)^2
362+60x+25 (6x+5)(6x+5)