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Based on the following function.?

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The GED Mathematical Reasoning test measures your algebraic and quantitative problem-solving skills and requires you to demonstrate an understanding of mathematical concepts, the skill to use those concepts, and the ability to apply knowledge in real-world scenarios.
 


Based on the following function.<br><img alt='images' src='https://www.fatskills.com/images2/GED/eq01169.png'/><!--<m:math xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>f</m:mi><m:mrow><m:mo>(</m:mo><m:mi>x</m:mi><m:mo>)</m:mo></m:mrow><m:mo>=</m:mo><m:mn>8</m:mn><m:mo>-</m:mo><m:mn>4</m:mn><m:mi>x</m:mi></m:mrow></m:math>-→<br>What is the value of the function when <img alt='images' src='https://www.fatskills.com/images2/GED/eq01170.png'/><!--<m:math xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>x</m:mi><m:mo>=</m:mo><m:mo>-</m:mo><m:mn>1</m:mn></m:mrow></m:math>-->?






 
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