Question

Use the quadratic formula to solve the quadratic equation x2 − 8x − 4 = 0.

Answer 1

\(\bf x^2 - 8x - 4 = 0\implies

y={\color{blue}{ 1}}x^2{\color{red}{ -8}}x{\color{green}{ -4}}
\qquad
x= \cfrac{ - {\color{red}{ b}} \pm \sqrt { {\color{red}{ b}}^2 -4{\color{blue}{ a}}{\color{green}{ c}}}}{2{\color{blue}{ a}}}\)