How do you find the roots, real and imaginary, of #y=(x/5-1)(-2x+5)# using the quadratic formula?
No need to use the quadratic formula to find the roots since the equation is already factored out. Equate y to 0 to find the roots.
If you really need to use the quadratic formula
Given the quadratic equation
Proceeding with the computation should give us the same result as with the one above.