Question

Poin 50 jangan asal, ASAL DI BACOK

Answer 1

2. diket:

maaf ga punya aplikasi untuk membuat grafik,yg jls terbuka ke bawah krn a bernilai negatif. tp setelah dikalikan negatif maka kurva terbuka keatas kr a positif
a. pembuat nol.
saat y = 0,maka (x + 5)(x - 1) = 0
x + 5 = 0 => x = -5 (-5,0) atau x - 1 = 0 => x = 1 (1,0)
saat x = 0 maka y = 0^2+4.0-5= -5 (0,-5)
b. pers sb simetri
x = -b/2a
a = 1,b= 4,c = -5
x = -4/2.1
x = -4/2 = -2
c. nilai minimum.
titik puncak minimum
y = - D /4a
D = b^2 - 4.a.c
= 4^2 - 4.1.(-5)
= 16 + 20
= 36
y = - 36/ 4
= -9 => nilai minimum
ttk punck = (-2,-9)
d. f(x) jk x = 0
y = x^2+4x - 5
y = 0 + 0 - 5 = -5

Answer 2

F(x) = - x² - 4x + 5

a) pembuat nol fungsi

→ - x² - 4x + 5 = 0

( - x + 5)(x + 1) = 0

-x = -5

x = 5

x + 1 = 0

x = -1

hp = { (-1, 0) , (5, 0) }

b) sumbu simetri

→ x = -b/2a

x = -(-4)/2(-1)

x = 4/-2

x = -2

c) nilai minimum fungsi,

y = (b² -4ac)/-4a

y = (-4² - 4(-1)(5)/-4(-1)

y = (16+20)/4

y = 36/4

y = 9

nilai minimum = { -2 , 9 }

d) f(0) = -(0)² - 4(0) + 5

f(0) = 0 - 0 + 5

f(0) = 5

( 0, 5 )