Question

c) 2𝑥² + 2x +1/2 = 0

Answer 1

\(\Leftrightarrow x=-\dfrac{1}{2}\)

Answer 2

\(\Leftrightarrow2\left(x^2+x+\dfrac{1}{4}\right)=0\Leftrightarrow2\left(x+\dfrac{1}{4}\right)^2=0\Leftrightarrow x=-\dfrac{1}{4}\)

Answer 3

\(2x^2+2x+\dfrac{1}{2}=0\)

\(\Leftrightarrow4x^2+4x+1=0\)

\(\Leftrightarrow\left(2x+1\right)^2=0\)

\(\Leftrightarrow2x+1=0\)

\(\Leftrightarrow2x=-1\)

\(\Leftrightarrow x=-\dfrac{1}{2}\)

Vậy S = {\(-\dfrac{1}{2}\)}

Answer 4

\(2𝑥^2 + 2x +1/2 = 0\)

=\(2x(x+1)=1/2\)  hoặc 0