Question 260624
18z + 45 + z^2?

rewrite

z^2 +18z+45=0

z^2+15z+3z+45=0

z(z+15) + 3(z+15) =0
(z+15)(z+3) =0

z=-15 or z= -3

M ananth--------- mananth@hotmail.com