Note: Recalculate the discriminant. It has to be:
Because:
Just a bit confused here and would appreciate a little guidance please.
Find the x intercept when y=0
0 = -x^2 + 4x +5
x^2 - 4x - 5 = 0
(x-1)(x-5) = 0 (Something here I think is not quite right)?
multiply out the brackets;
x^2 - 5x - x +5 = 0
x^2 - 6x + 5 = 0 (This can't be right it does'nt equal the original equation)?