Solve the Equation Without Using a Calculator $\log \left( x ^ { 7 } \right) = ( \log x ) ^ { 2 }$

Multiple Choice

Solve the equation without using a calculator. $\log \left( x ^ { 7 } \right) = ( \log x ) ^ { 2 }$

A) 1 and 10
B) 2 and 1,000,000
C) 1,000,000
D) 1 and 10,000,000
E) 10,000,000