Question

[Yến linh]

giúp mik vs ạ!!!

câu e, f, g thôi nha

Answer 1

[Nguyễn Hoàng Minh]

\(e,\left(x-2\right)^2-16=0\\ \Leftrightarrow\left(x-6\right)\left(x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=6\\x=-2\end{matrix}\right.\\ f,x^2-5x-14=0\\ \Leftrightarrow\left(x-7\right)\left(x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=7\\x=-2\end{matrix}\right.\\ g,8x\left(x-3\right)+x-3=0\\ \Leftrightarrow\left(8x+1\right)\left(x-3\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{8}\\x=3\end{matrix}\right.\)

Answer 2

[bepro_vn]

e)\(\left(x-2-4\right)\left(x-2+4\right)=\left(x-6\right)\left(x+2\right)\)

f)\(x^2-5x-14=x^2-2.\dfrac{5}{2}x+\dfrac{25}{2}+\dfrac{3}{2}=\left(x-\dfrac{5}{2}\right)^2+\dfrac{3}{2}\)