Question

factorise:
(z-15) (z-3)​

Answer 1

To convert factorized form into equation:-

$\implies \: (z - 15)(z - 3)$

$\implies \: {z}^{2} - 3z - 15z - 45$

Final answer:-

$\implies \: {z}^{2} - 18z - 45$