Help please I'm begging Solve for x. Choose the most correct answer.

x² = 225

Question 2 options:

x = -15

x = 15 and -15

x = 112.5

x = 15

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap