Question

Quadratic equations help!

Answer 1

-5x^2 - 4x - 1 = 0

Answer 2

I know that -5 is a, -4 is b, and -1 is c.

Answer 3

So then I put it into the equation and I get:
x = 4 + - the square root of -4^2 - 4*-5*-1 divided by 2 * -5

Answer 4

@phi @robtobey @RadEn @shamil98

Answer 5

@dpasingh

Answer 6

yes
\[ x = \frac{-b±\sqrt{b^2-4ac}}{2a} \\
x = \frac{-(-4)±\sqrt{(-4)^2-4(-5)(-1)}}{2(-5)} \\
x = \frac{4±\sqrt{16-20}}{-10}\\
x = \frac{4±\sqrt{-4}}{-10}\\
x = \frac{4±2i}{-10}\\
x= -\frac{4}{10} ± \frac{2}{10}i\\
x= - \frac{2}{5} ±\frac{1}{5}i
\]