Answer:
B he used the incorrect formula for the volume of the prism
They are all 3D. But they are all different shapes
Converting to vertex form is one way of doing this
2x^2 + 12x + 19
= 2(x^2 + 6x) + 19
= 2 [ x + 3)^2 - 9] + 19
= 2(x + 3)^2 - 18 + 19
= 2(x + 3)^2 + 1
the minimum value is 1
The answer is x = 3.
Hope this helps (:
