(Solved): Solve for \( \mathrm{x} \) for each equation. Show your work for full marks. Express your answer in ...

Solve for \( \mathrm{x} \) for each equation. Show your work for full marks. Express your answer in exact form when possible. Otherwise, round your answer to the nearest hundredth. Each question is worth of 3 marks. (a) \( 486=2 \log _{3} x \) (b) \( -\log x^{3}=3 \)