RRB Government Jobs Exams

The value of x that makes x^2 + 6x + 13 maximum is equal to
option
A. 6
B. -3
C. 13
D. 3

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RRB Other Question
For all x real, (x^2 -4x + 4) =
A. x - 2
B. x + 2x + 2
C. |x - 2|
D. x + 2 eln(3) - ln(2) + ln(1/x) =