Chapter 4 - Section 4.1 - Integer Exponents and Scientific Notation - 4.1 Exercises - Page 276: 25

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According to page 267, $a^{0}=1$ (where $a$ is a nonzero real number). In other words, we know that any nonzero real number raised to a power of 0 will equal 1. Therefore, $-8^{0}=-(8^{0})=-(1)=-1$. Recall that the base of the exponent in this case is 8 and not -8.