Question

Dikketahui f(x) = 4x + 2 dan g (x) = 2x + 4. tentukan
A (f + g)(4)
B(f x g)(-2)

Answer 1

4x + 2 = 2x+4
4x-2x = 4-2
2x = 2
x = 1
f(1)  = 4.1+2 = 6
g(1) = 2.1+4 = 6

A. (f+g)(4) = (6+6)(4) = 12.4 = 48
B. (f . g)(-2) = (6.6) (-2) = 36 . -2 = -72

Answer 2

Diket : f(x) = 4x + 2
          g(x) = 2x + 4

a. ( f + g ) ( 4)
= 4x + 2 + 2x + 4
= 6x + 6
= 6 ( 4) + 6
=30

b. ( f x g ) ( -2 )
= (4x + 2 ) ( 2x + 4 )
= 8x ² + 16x + 4x + 8
= 8x² + 20x + 8
= 8 (-2)² + 20(-2) + 8
= 32 - 40 + 8
= 0