It is: 23*32 = 72
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5 x 72 = 245
2^3 x 3^2 = 72
196 = 22 x 72
The prime factorization of 72 is 23 x 32.
9x2x2x2 = 9 x 8 = 72 but it's not the prime factorization of 72 as 9=3x3 The prime factorization of 72 is 2x2x2x3x3 = 2^3 x 3^2