Question

Solve the equation, , using the quadratic formula.
Question 4 options:



x = -1 or



x = -1 or x = 2



x = 1 or



x = 1 or

Answer 1

Answer:

 $x=1\ or\ x=-\frac{1}{2}$

Step-by-step explanation:

To solve the given quadratic equation $2x^2-x-1=0$ you can apply the Quadratic formula, which is shown below:

$x=\frac{-b\±\sqrt{b^2-4ac}}{2a}$

Where:

$a=2\\b=-1\\c=-1$

Therefore, when you substitute values into the Quadratic formula shown above, you obtain the following solution:

$x=\frac{-(-1)\±\sqrt{(-1)^2-4(2)(-1)}}{2*2}$

$x=1\ or\ x=-\frac{1}{2}$