tolong dibantu ya, trimakasih

Penyelesaian:

f(x) = x² - 3x + a
g(x) = 2x + b

x(1) -> f(x) = g(x)

f(1) = 1² - 3(1) + a
f(1) = a - 2

g(1) = 2(1) + b
g(1) = b + 2

f(1) = g(1)
a - 2 = b + 2
a - b = 4  (C).