What should I do to find the root number of this equation?

This old tunnel was once a key point of transportation.

He is good at mathematics.

There is a large water tank in my room.

There are many beautiful water plants growing in this pond.

He went to the hospital because of dropsy.

In accordance with his will, we conducted his burial at sea.

I like solving sudoku puzzles every day.

A complex number is a combination of a real number and an imaginary number.

This function requires two arguments.