Question 1096547
<br>If you really mean that a root is {{{5^2/3}}}, then tutor ikleyn's answer is right.<br>
{{{x-5^2/3 = 0}}}
{{{3x-5^2 = 0}}}, or {{{3x-25 = 0}}}
which would give you the polynomial 
{{{p(x) = 3x-25}}}<br>
My guess is that you really wanted a root to be {{{5^(2/3)}}}<br>
{{{x-5^(2/3) = 0}}}
{{{x = 5^(2/3)}}}
{{{x^3 = 5^2}}}
{{{x^3 = 25}}}
which would give you the polynomial
{{{p(x) = x^3-25}}}