Question 1

Factorise completely:

(a) \( 5x + 15\) (b) \( 3x - 12\) (c) \( 7x + 21\)
(d) \( 12x + 18\) (e) \( 4x - 6\) (f) \( 8x + 20\)
(g) \( 6x - 9\) (h) \( 25x - 15\) (i) \( 5x + 5\)
(j) \( 14x - 21\) (k) \( 8a + 3\) (l) \( 9x + 3\)

Question 2

Factorise completely:

(a) \( x^2 + 4x\) (b) \( y^2 - y\) (c) \( 7y^2 - 3y\)
(d) \( x^2 - 5x\) (e) \( 3x^2 + 2xy\) (f) \( 8x^2y + 3x\)
(g) \( a^3 - 4a\) (h) \( bx^2 - ax\) (i) \( a^2x + 4ab\)
(j) \( 3x^2 - 5xy + 2x\) (k) \( 4x^3 + 7x^2\) (l) \( 9x^3y - 5bx^2 + 2bx\)