The face value<span> is the value of a </span>coin<span>, </span>stamp<span> or </span>paper money<span>, as printed on the coin, stamp or bill itself by the issuing authority. The face value of coins, stamps, or bill is usually its legal value. However, their market value need not bear any relationship to the face value. For example, some rare coins or stamps may be traded at prices considerably above their face value. so the face value is $7000</span>
The answer would be x=15+\sqrt{258},\:x=15-\sqrt{258}
