Question

Tolong kak dijawab besok dikumpulkan soalnya ​

Answer 1

Verified answer

Jawab:

4)  f(x)= 2x² -5x  -1 . g(x)  = 2x + 3 , h(x) =  3x - 1

a, (f +g) = 2x² -5x  -1  + 2x + 3 = 2x² - 3x  + 2

b. (f - h) = 2x² - 5x - 1  - (3x - 1) = 2x² - 8x

c. 2g + h = 2 (2x + 3) + (3x - 1) = 4x + 6 + 3x - 3 = 7x + 3

d. g . h = (2x+3)(3x -1) = 6x²  +7x 0 3

5) f(x) = x² +2x- 1

g(x) = 5x- 2

h(x) = x - 7

a) fog(x) = f (5x-2) = (5x-2)² + 2(5x-2) -1

= 25x² -20x + 4 + 10x - 4 - 1

= 25x² -10x - 1

b) gof(x)  = g (x² +2x - 1) = 5 (x² +2x -1) = 5x² +10x - 5

c) gog(2) = g { g(2) } = g { 5(2)- 2} = g{10-2} = g(8)

gog(2) = 5(8) - 2 = 40-  2 = 38

no. 2, 3 di lampiran