well you find g(-1) which is g(-1) = (-1)^2 - 2(-1) = 3
then you shove thawt into f since g(-1)=3
so f(g(-1)) = f(3) = 3+2= 5
in other words f(x) = x + 2 and g(x) = x² - 2x have composition
f(g(x)) = (x² - 2x) + 2
remember in function notation, where ever you see x you replace
e.g. f(x) = x + 2,
f(2) = 2 + 2
f(3) = 3+2
f(x+y) = x+y+2
so f(g(-1)) = g(-1) + 2
