Ini caranya gmn ya... tolong di bantu ya teman2

Materi : Operasi pada Fungsi

f(x) = 2x - 5
g(x) = 4x + 1

a. (f+g)(5)
= f(5) + g(5)
= 2(5) - 5 + 4(5) + 1
= 10 - 5 + 20 + 1
= 26

b. (f-g)(3)
= f(3) - g(3)
= 2(3) - 5 - 4(3) - 1
= 6 - 5 - 12 - 1
= -12

c. (3f - g)(3)
= 3f(3) - g(3)
= 3(2(3) - 5) - 4(3) - 1
= 3(1) - 12 - 1
= -10

d. (f.g)(x)
= f(x) . g(x)
= (2x - 5)(4x + 1)
= 8x² + 2x - 20x - 5
= 8x² - 18x - 5

e. (f.g)(1)
= 8(1)² - 18(1) - 5
= 8 - 18 - 5
= -15