Question

Question 3(iv)
Factorise
$15pq+15+9q+25p$

Answer 1

$15pq+15+9q+25p=15pq+9q+25p+15=3\times 5\times p\times q+3\times 3\times q+5\times 5\times p+3\times 5=3q(5p+3)+5(5p+3)=(5p+3)(3q+5)$