Mathematics for IGCSE & O level - Sketching Curves (Section 1 - No. 12)
Which statement is true for a cubic function of the form y = ax³ when a is positive?
The graph opens downwards.
The graph has a turning point.
The graph increases as x increases.
The graph is symmetrical about the x-axis.
Explicación
A positive 'a' value means the graph increases as x increases.