diberikan f ( X ) = x² + X + 1 dan g ( X ) = X + 2 nilai dari f ( X ) - ( g o f ) ( X ) + g ( X ) =

f(x)=x²+x+1
g(x)=x+2
nilai dari f(x)-(g o f)(x)+g(x)
=(x²+x+1)-(x²+x+3)+(x+2)
=x

f(x) = x² + x + 1
g(x) = x + 2

(gof)(x)
= g(f(x))
= (x² + x + 1) + 2
= x² + x + 3

Maka
f(x) - (gof)(x) + g(x)
= (x² + x + 1) - (x² + x + 3) + (x + 2)
= x² - x² + x - x + x + 1 - 3 + 2
= x