Answer
$x^3-15x^2+75x-125$
Work Step by Step
Plugging in the values we get: $V=(x-5)(x-5)(x-5)=(x^2-5x-5x+25)(x-5)=(x^2-10x+25)(x-5)=x^3-10x^2+25x-5x^2+50x-125=x^3-15x^2+75x-125$
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