double majors and supplementary essays

i am a senior in high school and i want to double major. the school of my choice has different departments for my intended majors and they have different prompts for supplementary essays. do i need to write two essays or can i just apply to one department, get accepted then declare my other major?

It’s going to be more complicated than either. I don’t know about your school, but at mine you apply with one major only, then fill out a petition to add a second major. That’s probably what you need to do. You need to prove that you can fulfill the requirements of both majors in a reasonable timeframe, and your second major needs to actually have room for you. If it’s a competitive major to enter or one where students cannot easily find classes, this can be extremely difficult, and they may well deny you.

Depends on the school. What college is it?

Cornell