Question

5x²+2x-1=0

Answer 1

$5x^2+2x-1=0$ is a quadratic equation with the form of $ax^2+bx+c=0$

Using quadratic formula,

$x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}$ and substitute the values,

$x=\frac{-2 \pm \sqrt{2^2-4\times 5\times (-1)}}{2\times 5}$

$x=-0.69,+0.29$ are the required roots of the quadratic equation.