Find the value of $$5y \sqrt{y^3 - y^2}$$ when $$y = 5$$
Substituting y=5
Equation becomes
$$ 5 \times 5 \sqrt{5^3-5^2} $$
$$ = 25 \sqrt{125-25} $$
$$ = 25 \sqrt{100} $$
$$ = 25 \times 10 $$
  =250
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