Question 253402
f(x)=4x^2-4x-2 
The domain is all real numbers, not the numbers listed above.
-a/2b=4/8=1/2 (x at the minimum) If a is positive it has a minimum.
4(1/2)^2-4(1/2)-2
=1-2-2
=-3 (y at the minimum)
The range is (infinity to -3]
.
Ed
.
{{{graph(500,500,-10,10,-10,10,4x^2-4x-2)}}}