Answer
$f(-3) = 27$
Work Step by Step
$f(x) = x^2-4x+6$, let $x=-3$
$f(-3) = (-3)^2-(4*-3)+6$
$f(-3) = 9--12+6$
$f(-3) = 9+12+6$
$f(-3) = 27$
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