Question

How do you solve the quadratic using the quadratic formula given `a^2-5a+8=0`?

Answer 1

`a=(5+-isqrt7)/2`

Explanation:

Start by calculating the discriminant
`Delta=b^2-4ac=25-32=-7`
`Delta<0`
`sqrt(Delta)=isqrt7`
so there are no solutions in `RR` but in `CC`
`a=(5+-isqrt7)/2`