Question

5) tentukan titik puncak dari fungsi f(x) = x²-4x-21

Answer 1

Dy/dx = 0

2x - 4 = 0
x = 2

f(2) = 2^2 - 4(2) - 21
f(2) = -25

Kordinat = (x,y) = (2, -25)

Answer 2

f(x) = x² - 4x - 21   ------> a = 1 ; b = - 4   ; c = - 21
koordnat titi puncak ( , 
= 
    = 
    = 2
= 
    = 
    = 
    = 
    = - 25
jadi ,koordinat puncak (2 , - 25)