jika fungsi g(x)=2x-4 dan (gof) =4x kuadrat -20x+26, nilai f(-)

langsung aja y

(gof)(x) = g{f(x)}

4x² - 20x + 26 = 2f(x) - 4

4x2 - 20x + 26 + 4 = 2f(x)

2(2x² - 10x + 15) = 2f(x)

2x² - 10x + 15 = f(x)

maka
f(-1) = 2(-1)² - 10(-1) + 15
f(-1) = 2 + 10 + 15
f(-1) = 27

semoga berguna +_+