Question 1031177
Express f(x) = (5-x)(x+1) in standard form.
f(x) = -x^2 -x+5x + 5 = -x^2 + 4x + 5
------------------------------------------

Find the vertex and axis of symmetry.
Vertex occurs when x = -b/(2a) = -4/(-2) = 2
f(2) = (5-2)(2+1) = 3*3 = 9
----
vertex (x, y) = (2,9)

axis of symmetry = x = 2
-----------------
Cheers,
Stan H.
-------------