### Home > CALC > Chapter 11 > Lesson 11.1.3 > Problem11-37

11-37.

Multiple Choice: The cubic $y = x^3 − ax^2 + 2$ is concave up on the interval:

1. $[0, a]$

1. $( - \infty , \frac { a } { 3 } ]$

1. $[ \frac { a } { 3 } , a ]$

1. $[ \frac { a } { 3 } , \infty )$

1. $( - \infty , \infty )$

$y^{\prime\prime} = 6x-2a > 0$