Answer
$$125x^3+75x^2+15x+1$$
Work Step by Step
Finding the product, we obtain:
$$\left(5x\right)^3+3\left(5x\right)^2\cdot \:1+3\cdot \:5x\cdot \:1^2+1^3\\ 125x^3+75x^2+15x+1$$
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