Answer:
(2,-9)
Step-by-step explanation:
Multiply out the polynomial to get:
x^2-4x-5
the vertex formula is -b/2a (use the coefficients of the equation above)
-(-4)/2(1) = 4/2 = 2
we know the x value of the vertex is 2. Now we can plug that into the original equation to get the y value.
(2-5)(2+1)
(-3)(3) = -9
so the coordinate is (2,-9)
