how do i solve 18z+45+z^2 using ax^2+bx+c with a=1

Question

Please explain to me in detail how to solve 18z+45+z^2

Answer 1

factor z^2+18z+45

45=3*3*5=3*(3*5)=3*15 and 3=15=18 and 18 is the coefficient of the middle term

(z+3)(z+15)