Jawapan

2015-10-09T12:53:12+08:00
X^2 + 5(1- x) -(x -4)
= x^2 +5 -5x - x +4
= x^2 -5x - x +5 +4
= x^2 -6x +9
= (x -3)(x -3)
= (x -3)^2
kenape tak x+3 ?
ouhh .. dah faham :)
:)