Question

4x mũ 2 + 8x +2 bằng 0

Answer 1

\(4x^2+8x+2=0\)

\(\Delta=8^2-4.4.2=64-32=32>0\)

=> pt có 2 nghiệm phân biệt

\(\left\{{}\begin{matrix}x_1=\dfrac{-8+\sqrt{32}}{8}=\dfrac{-2+\sqrt{2}}{2}\\x_2=\dfrac{-8-\sqrt{32}}{8}=\dfrac{-2-\sqrt{2}}{2}\end{matrix}\right.\)