Answer
$f(t+1)=6t^{2}+12t+4$
Work Step by Step
$f(t+1)=$ ... substitute x with $(t+1)$ and simplify
$=6(t+1)^{2}-2$
$=6(t^{2}+2t+1)-2$
$=6t^{2}+12t+6-2$
$=6t^{2}+12t+4$
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