Well with the given function, let's test it out. 0^2 + (-3) = -3. A.) and D.) are our only answers so far. Let's try with 1 now. 1^2 + (-3) = 1-3, = -2. Let's keep on going because we haven't completely done it. 3^2 + (-3) = 9 -3, = 6. A.) is incorrect. D.) is our correct answer, since none of the answers above are correct! I hope this helps!