diketahui g(x) =x^2+x+2 dan (fog)(x) =2 x^2 +2x+5 nilai f(x)

fog(x) = f(g(x))

f(x^2 + x + 2) = 2x^2 + 2x + 5
f(x^2 + x + 2) = 2x^2 + 2x + 4 + 1
f(x^2 + x + 2) = 2(x^2 + x + 2) + 1
f(x) = 2x + 1

Langsung aja y

(fog)(x) = f{g(x)}
2x² + 2x + 5 = f(x² + x + 2)
2(x² + x + 2) + 1 = f(x² + x + 2)
2x + 1 = f(x)

Atau
f(x) = 2x + 1

Semoga berguna +_+