Di bantu yaa soalnya kurang begitu faham hahah

jawab

f(x) = - x² - 2x + 8
a = -1
b = - 2
c = 8

a)
bayangan 2 
f(2) = - (2)² - 2(2) + 8
f(2) =- 4 - 4 + 8
f(2) = 0

bayangan 3
f(3) = -(3)² - 2(3) + 8
f(3) = -9 - 6 +8
f(3) = - 7

b. Persamaan sumbu simetris x = - b/2a
x = -(-2)/(2)(-1)
x = 2/-2
x = - 1

c. titik potong dengan  sb x, y  = 0
- x² - 2x + 8 = 0
x² + 2x - 8 = 0
(x + 4)(x  - 2) =0
x = - 4  atau x= 2

titik potongnya di ( -4,0) atau (2, 0)

d. titik ekstrimx ( x,y)
x = - b/2a = -1
y = -(1)² - 2(-1) + 8
y = - 1 + 2 + 8
y = 9
titik ekttrims (x,y) =( -1, 9)