The GCF is 4x2.
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4x
X3 - 4X2 - 45XX(X2 - 4X - 45)=============X is only common factor here.
If that's + 4x2, the answer is 2x(x2 + 2x - 4)
4x2+20x+25 (2x+5)^2
Make a factor-tree and the look for the matches of their prime factorization... Using 6 and 8: 6......... 8 2x3.....4x2 .........2x2 so the prime factorization of 6 is 2x3 and 8 is 2x2x2 so the only match you have is two so the gcf of 6 and 8 is 2