Question 1196708
{{{2(9-2*2)(10-2*2)}}}, the volume in cubic inches

{{{2(5)(6)}}}


That equal to {{{4x^3-38x^2+90x=2*5*6}}}

{{{2x^3-19x^2+45x=5*6}}}

{{{2x^3-19x^2+45x-30=0}}}


One root is x=2, if try Rational Roots Theorem.

<pre>
2    |    2    -19    45    -30
     |
     |           4   -30     30
     |________________________________
         2     -15     15      0
</pre>
So the equation can be rewritten
{{{(2x^2-15x+15)(x-2)=0}}}
and general quadratic equation solution will help for roots of the quadratic factor.