Solve the problem.Find an equation of the function f sketched below in the form 
. Use the vertex to find the values of h and k and use a second point on the graph to find the value of a.
A. f(x) = (x + 1)2 - 1
B. f(x) = (x + 1)2 + 1
C. f(x) = (x - 1)2 - 1
D. f(x) = (x - 1)2 + 1
Answer: B
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