Jawapan

2016-10-02T11:13:52+08:00
Tu jwpn nye.....kalau salah sorry
2016-10-06T00:41:56+08:00
A) (4x-1)(x+5)
=4x²+20x-x-5
=4x²+19x-5

b)i)4x²-1
=(2x-1)(2x+1)

b)ii)2k²+5k-3
=(2k-1)(k+3)

b)iii)2(3-x²)=4x
6-2x²=4x
2x²+4x-6=0
x²+2x-3=0
(x+3)(x-1)=0
x=-3, x=1