A function fsatisfies , and a function gsatisfies . What is the value of ?

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A function fsatisfies <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04270.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>f</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mi>x</m:mi></m:mrow></m:mfenced><m:mo>=</m:mo><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup></m:mrow></m:math>-->, and a function gsatisfies <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04271.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>g</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mi>x</m:mi></m:mrow></m:mfenced><m:mo>=</m:mo><m:msqrt><m:mi>x</m:mi></m:msqrt></m:mrow></m:math>-->. What is the value of <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04272.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mn>4</m:mn><m:mi>f</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mrow><m:mn>3</m:mn><m:mi>g</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mn>2</m:mn></m:mrow></m:mfenced></m:mrow></m:mrow></m:mfenced></m:mrow></m:math>-->?