Question 1

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Considera la funció: begin mathsize 14px style bold f bold left parenthesis bold x bold right parenthesis bold equals open curly brackets table row cell begin bold style negative 9 times x plus 4 end style bold space bold space bold space bold space bold x bold less-than or slanted equal to begin bold style negative 20 end style end cell row cell begin bold style 6 times x squared minus 2 times x minus 1 end style bold space bold space bold space bold space bold x bold greater than begin bold style negative 20 end style end cell end table close end style.
Calcula begin mathsize 14px style bold f bold apostrophe subscript bold minus bold left parenthesis begin bold style negative 20 end style bold right parenthesis end style.

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