Using the product rule of exponents, we know that when multiplying two expressions with the same base, we add the exponents. This means:
\[ 8^2 \times 8^6 = 8^{(2 + 6)} \]
Therefore, the equivalent form of \( 8^2 \times 8^6 \) is:
a) \( 8^{(2 + 6)} \).