Question

y=-x^2+2x+3

Answer 1

what are you sloving for?

Answer 2

Tips for quick solving quadratic equations.
TIP 1. When a + b + c = 0, one real root is (1) and the other is (c/a)
TIP 2. When a - b + c = 0, then one real root is (-1) and the other is (-c/a).
Example above: y = -x^2 + 2x + 3 = 0.
We have a - b + c = 0, then one real root is (-1) and the other is (-c/a = (-3)/(-1) = 3.
Remember these 2 Tips. They will save you a lot of time.