The digit 6 has no meaning in base 4.
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4 * 4 * 4 * 4 (i.e. 44) = 256 (base 10). In base 2 (binary) this is:100000000.Which is 28.
5x5x5x5 can be written in exponential form as 5^4, where the base is 5 and the exponent is 4. This is because there are 4 factors of 5 being multiplied together.
34
9x9x9x9 = 94 = (32)4 = 32*4 = 38
8x8x8x8 = 84 = (23)4 = 23*4 = 212