Jawabanmu

2014-05-24T16:49:42+07:00

karena menyinggung, maka y1 = y2

ax^2 - 6x + 24 = 6x - 12

ax^2 - 12x + 36 = 0

m1 = m2
6 = 2ax - 6
ax = 6

karena
ax^2 - 12x + 36 = 0
maka
6x - 12x + 36 = 0
x = 6.

36a - 72 + 36 = 0
a = 1.

Persamaan parabola
y = x^2 - 6x + 24

xe = 6/2 = 3
ye = -D/4a = 60/4 = 15

jadi absisnya (3 , 15)