For which value of $c$ does the quadratic equation
$5x^2 - 6x + c = 0$
have exactly one solution in terms of $x$?
The solution is supposed to be $c = 1.8$, but I only ever get $c = 1$
I've tried to solve this like:
$ax^2 + bx + c = 0\implies 5 - 6 + c = 0$
but since this does not match with the textbook solution, I think I'm operating from a false premise.
What am I doing wrong?