SOLUTION: a room contains 144 chairs the number of chairs per row is two less than twice the number of rows. find the number of rows and the number of chairs per row.

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Question 359476: a room contains 144 chairs the number of chairs per row is two less than twice the number of rows. find the number of rows and the number of chairs per row.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let rows be x
chairs = 2x-2
..
x(2x-2)=144
2x^2-2x=144
x^2-x-72=0
x^2-9x+8x-72=0
x(x-9)+8(x-9)=0
(x-9)(x+8)=0
rows are 9
chairs = 2x-2 = 18-2 = 16
...
m.ananth@hotmail.ca