Question 962400
Let {{{ w }}} = width of the poster
{{{ 3w }}} = the length of the poster
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{{{ w + 8 )*( 2w + 8 ) = w*(2w) + 488 }}}
{{{ 2w^2 = 16w + 8w + 64  = 2w^2 + 488 }}}
{{{ 24w + 64 = 488 }}}
{{{ 24w = 424 }}}
{{{ w = 17.667 }}}
{{{ 2w = 35.333  }}}
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The dimensions of the poster are:
17 and 2/3 inches x 35 and 1/3 inches
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check:
{{{ w + 8 )*( 2w + 8 ) = w*(2w) + 488 }}}
{{{ 17.667 + 8 )*( 35.333 + 8 ) = 17.667*35.333 + 488 }}}
{{{ 25.667*43.333 = 624.228 + 488 }}}
{{{ 1112.228 = 1112.228 }}}
looks good -hope I got it