Try another version of this question Box 1: Enter your answer using interval notation. Example: [2,5)
Give the domain of `f(x)=-3x^2-8x+20` using interval notation.
Use U for union to combine intervals. Example: (-oo,2] U [4,oo)
Enter each value as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for an empty set. Use oo to enter Infinity. `(-oo,oo)`