We save the definition: f(t) = 4 -t22 -t Let's evaluate the domain of 4 -t22 -t For the expression 4 -t22 -t to be defined, we must have: 2 -t ≠ 0 ⓘ We add t to both sides 2 ≠ t ▶Domain of definition: t ≠ 2