Jawapan

2014-04-29T16:43:30+08:00
4x(x+4) = 9 = 16x
4x² +16x - 16x - 9 = 0
4x² - 9 = 0
4x² = 9
x² = 9/4
x = √9/4
x = 3/2
1 4 1