You can put this solution on YOUR website! describe how the graph of y=x^3 can be transformed to the graph y=(2x)^3
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y=(2x)^3=8x^3
In this form you can see the function is multiplied by 8. A multiplier generally makes the curve steeper, that is, gives the curve a greater slope.
See graph below:
Red curve is x^3 and green curve is 8x^3