For what value of $x$ does the value of $y$ reach its minimum? | Ronan SAT

|Question 16Math

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Text

The given equation relates the variables

x

and

y

:

y = x^{2} - 18 x + 51

.

For what value of

x

does the value of

y

reach its minimum?

-18

A

9

B

18

C

51

D