Jawapan

2015-03-22T10:27:29+08:00
X(x+4)-12
= x²+4x-12
= (x-2)(x+6)
  
  x=2 , x=-6

2015-03-22T12:50:56+08:00
Kembangkan x(x+4)= x2+4x Masukkan -12 dlm x2+4x = x2+4x-12 Faktorkan (x-2)(x+6) x=2 , x=-6