Mathematics for IGCSE & O level - Graphs Of Functions (Section 1 - No. 18)
If the coefficient of x³ in a cubic graph is negative, the graph will:
Start from top left and go to bottom right
Start from bottom left and go to top right
Have a U-shape
Have an inverted U-shape
Forklaring
A negative leading coefficient means the graph starts at the top left and goes to the bottom right.