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

`x=1\ or\ x=-(1)/(2)`

Explanation:

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

`x=(-b\±√(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=(-(-1)\±√((-1)^2-4(2)(-1)))/(2*2)`

`x=1\ or\ x=-(1)/(2)`