Question 1087345
{{{V=L*W*H}}}
{{{315=(7)(W)(W+4)}}}
{{{W^2+4W=45}}}
{{{W^2+4W+4=49}}}
{{{(W+2)^2=49}}}
{{{W+2=0 +- 7}}}
Only positive solutions make sense,
{{{W=-2+7}}}
{{{W=5}}}
and
{{{H=5+4=9}}}