Question

( Factorlise from 1 to 4)
(ii) 15ab? – 20 a²b​

Answer 1

Answer:

$15 {ab}^{2} - 20 {a}^{2} b \\ = 3 \times 5 \times a \times b \times b - 2 \times 2 \times 5 \times a \times a \times b \\ 5ab(3b - 4a)$

Answer 2

Answer:

$5ab(3b - 4a)$