Given f(x) = -0.4x 2 + 3.2x + 1.2, find the following algebraically (to one decimal place)

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Given f(x) = -0.4x2 + 3.2x + 1.2, find the following algebraically (to one decimal place) without referring to a graph:

(A) Intercepts 

(B) Vertex 

(C) Maximum or minimum 

(D) Range  

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