Tolong jawab pakai cara ya, jangan langsung jawab, jangan sembarangan juga ya jawabnya :)

4.
F(x) = 3x² + 6x + 1
y = 3(x²+2x) + 1
y = 3((x+1)² - 1) +1
y = 3(x+1)² - 3 + 1
y = 3(x+1)² -2
y + 2 = 3(x+1)²
(y+2)/3 = (x+1)²
(√y+2/√3) = x+1
(√y+2/√3) - 1 = x

F^-1(x) = (√x+2/√3) - 1
F^-1(-2) = (√-2+2/√3) - 1
= (√0/√3) - 1
= 0 - 1
= -1