Answer:
D: ( -∞, ∞)
Explanation:
The Domain is all values that 'x' can take on for the function. You need to determine if there are any restrictions (values 'x' can't be) and you will find the Domain. For the equation..
y = 2x² - 5, there are no restrictions on 'x'. 'x' can be any number in the real number set, so it's domain is ( -∞, ∞)