Given the function f(x)=2x−5\displaystyle {f{{\left({x}\right)}}}={2}{x}-{5}, evaluate and simplify the expressions below. See special instructions on how to enter your answers.

f(a)=\displaystyle {f{{\left({a}\right)}}}=  

f(a+h)=\displaystyle {f{{\left({a}+{h}\right)}}}=  

f(a+h)−f(a)h=\displaystyle {\frac{{{f{{\left({a}+{h}\right)}}}-{f{{\left({a}\right)}}}}}{{{h}}}}=  

Instructions: Simplify answers as much as possible. Expressions such as 4(x+2)\displaystyle {4}{\left({x}+{2}\right)} and (x+5)2\displaystyle {\left({x}+{5}\right)}^{{2}} should be expanded. Also collect like terms, so 3x+x\displaystyle {3}{x}+{x} should be written as 4x\displaystyle {4}{x}.

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