Question

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Answer 1

\(a,\)Đặt \(f\left(x\right)=0\)

\(\Rightarrow2x^2+5,2=0\)

\(\Rightarrow2x^2=-5,2\)

\(\Rightarrow x^2=-10,4\)

\(\Rightarrow x=\sqrt{-10,4}\left(ktm\right)\)

Vậy \(f\left(x\right)=\varnothing\)