Perhatikan grafik fungsi f (x) = 8 – 2x – x² di bawah ini. Koordinat titik baliknya adalah ​

Perhatikan grafik fungsi f (x) = 8 – 2x – x² di bawah ini. Koordinat titik baliknya adalah ​

(-1, 9)

 

Penjelasan dengan langkah-langkah:

f (x) = 8 – 2x – x²

f(x) = -x² – 2x + 8

a = -1, b = -2, c = 8

• sumbu simetri

x = -b/2a

= -(-2)/2.(-1)

= 2/(-2)

= -1

• nilai optimum

y = f(-1) = -(-1)² – 2(-1) + 8

= -1 + 2 + 8

= 9

• titik balik (x,y) = (-1, 9)

 

 

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Baca Juga :  Every mornIng I 1.____ at five o'clock. First. I go to the 2.____. I 3.____ my teeth and take a bath. After that, I get 4.____ and comb my hair. Then I go to the 5.____. I eat sandwich and a glass of milk for breakfast. Then, I go to 6.____ by my 7.____. I 8.____ at school and then I study. I go 9.____ at one o'clock. I have 10.____ and play with my friends. In The evening, I 11.____ dinner with my family and then we 12.____ watching TV. I do my 13.____. I go to 14.____ at half past nine.