Question

Himpunan penyelesian pers. kuadrat 3(x-2)^2 - 48 = 0 adalah.....
a. {-4,4}
b. {-2,-6}
c. {-2,6}
d. {2,-6}
e. {2,6}

Answer 1

3(x²-4x+4)-48=0
3x²-12x+12-48=0
3x²-12x-36=0
(3x-18)(x+2)

3x-18=0                  x+2=0
x=18/3=6                 x=-2

jadi Hp= {-2,6} (c)

Answer 2

x - 2 = -4
     x = -4 + 2
     x = -2

x - 2 = 5
     x = 4 + 2
     x = 6

HP = { -2, 6 }