\(E=-3x^2-x+6=-3\left(x^2+\dfrac{x}{3}\right)+6=-3\left(x^2+2x.\dfrac{1}{6}\right)+6=-3\left(x^2+2x.\dfrac{1}{6}+\dfrac{1}{36}\right)+6+\dfrac{1}{12}\le-3.0+6+\dfrac{1}{12}=6\dfrac{1}{12}\)

cái này ko tìm dc Min nha bạn (với x dương thì x càng lớn E càng nhỏ)

Ta có: \(E=-3x^2-x+6\)

\(=-3\left(x^2+\dfrac{1}{3}x-2\right)\)

\(=-3\left(x^2+2\cdot x\cdot\dfrac{1}{6}+\dfrac{1}{36}-\dfrac{73}{36}\right)\)

\(=-3\left(x+\dfrac{1}{6}\right)^2+\dfrac{73}{12}\le\dfrac{73}{12}\forall x\)

Dấu '=' xảy ra khi \(x=-\dfrac{1}{6}\)

Đề sai rồi bạn

:D?

a) \(\Rightarrow\left(x-3\right)\left(x+4\right)=5.12\)

\(\Rightarrow x^2+x-72=0\)

\(\Rightarrow\left(x-8\right)\left(x+9\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x=8\\x=-9\end{matrix}\right.\)

b) \(\Rightarrow\left(x+3\right)^2=36\)

\(\Rightarrow\left[{}\begin{matrix}x+3=6\\x+3=-6\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=3\\x=-9\end{matrix}\right.\)

c) \(\Rightarrow2x^2=8\Rightarrow x^2=4\)

\(\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)