Question 553314
rows be x
seats in each row = x+8

seats = 180

x(x+8)=180
x^2+8x=180
x^2+8x-180=0

x^2+18x-10x-180=0
x(x+18)-10(x+18)=0
(x+18)(x-10)=0
x= 10 number of rows