The rule you use is a^b*a^c = a^(b+c). You add the exponents and keep the base the same. This rule cannot be used if you are multiplying two exponential expressions with different bases.
In this case, a = 4, b = 4, c = 8.
Answer:
4^12
Explanation:
4^4 * 4^8
When we are multiplying power with the same base, we can add the powers
a^b * a^c = a^ (b+c)
4^(4+8)
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