The GCF of 4 and 12 is 4.
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If you are talking of 20 and 24 then factor both to prime factors. 20=2x2x5 24=2x2x2x3 circle the common ones. 2x2=4 the greatest common factor.
2x2-x-6 = (2x+3)(x-2)
the prime factorization of 32 is 2x2x2x2x2 and the factor tree is 32 8 4 2x4 2x2 2x2
4x4 + 1 = (2x2 - 2x + 1)(2x2 + 2x + 1)
2x2+13x+15 = (2x+3)(x+5)