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If the graph of the function f, defined by f(x)= x2 + 5, is translated vertically upward by 2 units, it
becomes the graph of a function k. Find the expression for k(x).
A. k(x)=x2 + 3
B. k(x)=(x + 2)2 +5
C. k(x)=(x - 2)2 +5
D. k(x)= x2 +7
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