Factorise the following expression :

Answer:
(i) [tex]5x(x - 5y)[/tex]
(iv) 12a²b(3-5c)
Step-by-step explanation:
(i) [tex]5 {x}^{2} - 25xy[/tex]
[tex]5 {x}^{2} - 25xy = (x - y)[/tex]
[tex]5x(x - 5y)[/tex]
(iv) 36a²b - 60a²bc
12a²b(3) - 60a²bc
12a²b(3) + 12a²b(-5c)
12a²b(3-5c)