Try the following GMAT Problem Solving question on finding the maximum value of a quadratic algebraic expression.
Question 62:
For any real value of $x$ the maximum value of $8x3x^2$ is:

$\quad 0$

$\quad \dfrac{8}{3}$

$\quad 4$

$\quad 5$

$\quad \dfrac{16}{3}$
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