Given the function
f(x)={1x2−7x<12x2−7x≥1\displaystyle {f{{\left({x}\right)}}}={\left\lbrace\begin{array}{cc} {1}{x}^{{2}}-{7}&{x}<{1}\\{2}{x}^{{2}}-{7}&{x}\geq{1}\end{array}\right.}

Calculate the following values:
f(−2)=\displaystyle {f{{\left(-{2}\right)}}}=  
f(1)=\displaystyle {f{{\left({1}\right)}}}=  
f(2)=\displaystyle {f{{\left({2}\right)}}}=  

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