diketahui fungsi g)x)=x+1 dan f(x)=x²+x-1.komposisi fungsi (fog) (x)

jawab

g(x)= x + 1
f(x)= x²+ x - 1

fog(x) = f {g(x)}
= f(x+1)
= (x +1)² + (x+1) - 1
= x² +2x +1 + x + 1 - 1
= x² + 3x  + 1