Jawapan

2016-09-22T12:39:56+08:00
Lebar kolam = L
Panjang kolam = L+15
Luas = 700m²
Lebar x Panjang = Luas
L × (L+15) = 700m²
L² + 15L = 700
L² + 15L - 700 = 0
L1 = (-b + √(b² - 4ac))/2a = .......
L2 = (-b - √(b² - 4ac))/2a = .......