a). x2- 4x = 12 = 0 b) 2x+4y - 18 juka y= x - 3

a) x^2 - 4x - 12 = 0
Cari akarnya menggunakan pemfaktoran
(x-6)(x+2) =0
x-6 = 0
x = 6
Atau
x+2 = 0
x = -2

b) 2x + 4y - 18 =..... (y = x-3)
Masukkan nilai y
2x + 4(x-3) - 18 =
2x + 4x - 12 - 18 =
6x - 30
6x = 30
x = 30/6
x = 5