Question

Solve the following quadratic equation: -2x^2 – x – 1 = 0

Answer 1

\[
2x^2 + x –1 = 0\\
a=2; b=1; c=1;\\
b^2 - 4ac= 1 -8=-7\\
\sqrt{-7}= i\sqrt 7
\]

Answer 2

\[
x= \frac{1}{4} \left(-1\pm i
\sqrt{7}\right)
\]