Question

What is the maximum value that the graph of `y= x^2 -4x`?

Answer 1

There is no maximum.

Explanation:

As `x` increases without bound, `x^2-4x` also increases without bound. (Another way of saying this is: `lim_(xrarroo)(x^2-4x) = oo`.) That means there is no upper bound and no maximum.