# Find the linear approximation of the function f(x)=\sqrt{4-x} at a=0

Find the linear approximation of the function $$\displaystyle{f{{\left({x}\right)}}}=\sqrt{{{4}-{x}}}$$ at a=0
Use L(x) to approximate the numbers sqrt (3.9) and sqrt (3.99) Round to four decimal places

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Laith Petty

Given the function: