if statement not working

[trent101010]

Without really getting into the code (there are a number of errors), I would say you need to indent your first if/else statement. In comparisons, you need to use '==' not '='. Change your first 'else' to an 'elif == i' and so on.
To get you started, basically you want

print("Math God")
print("Welcome to Math God! Made by Trent in 2018!")
print("In this game, you have a minute to answer the math problem correctly. If you get it wrong or run out of time, you get a strike. Three strikes and the game is over.")
while True:
    x = input("There are three modes to this game: quadratic, interest, and order of operations. Type 'q' for quadratics, 'i' for interest, and 'o' for order of ops.")
    try:
        if x == 'q':
           print("You have selected quadratics. Press any key to start.")
        elif x == 'i':
           print("You have selected interest. Press any key to start.")
        elif x == 'o':
           print("You have selected order of operations. Press any key to start.")
    except:
        print("Sorry, but you didn't correctly choose a valid mode. Press any key to continue.")
        # return

I got a bad input error on line 8

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Fix the indentation to equal spaces. The if block inside the try/except must be indented.
You can't use just input() in a script without an assignment.

I was just trying for the other inputs to make a "Press any key to continue." kind of thing.