What is the value of ?

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What is the value of <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03336.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mn>5</m:mn><m:msqrt><m:mrow><m:mn>20</m:mn></m:mrow></m:msqrt></m:mrow></m:math>-->?