find the zeros by factoring
-x^2 - 4x + 5 = y
y = -(x^2+4x-5)
y = -(x+5)(x-1)
Now, if a product of factors is zero, any of the factors can be zero.
So, which values of x make each of the factors zero?
-x^2 - 4x + 5 = y
y = -(x+5)(x-1)
Now, if a product of factors is zero, any of the factors can be zero.
So, which values of x make each of the factors zero?