Substitute the points into the equation.
3.84 = ab2
3.072 = ab3
Solve 3.84 = ab2 for a, then substitute that into the other equation and solve for b.
Once you have solved for b, substitute that value back into one of the original equations and solve for a.
Check your work using the eTool below. Does your equation pass through the two points plotted on the graph?
Click on the link at right for the full eTool version: CCA 10-33 HW eTool