What is the vertex form of f(x) = -5x^2-2x+9 ?

1 Answer
Feb 12, 2018

Vertex is (-0.2 , 9.2) and vertex form of equation is f(x) = -5(x+0.2)^2+9.2

Explanation:

f(x) = -5x^2-2x+9 or f(x) = -5(x^2+0.4x)+9 or

f(x) = -5(x^2+0.4x+(0.2)^2)+5*0.04+9 or

f(x) = -5(x+0.2)^2+9.2 . Vertex is (-0.2 , 9.2) and

vertex form of equation is f(x) = -5(x+0.2)^2+9.2 [Ans]