Asked by Anonymous
If a ractangle has a length of 2x-1 and width x+5 and has an area of 156 square units, what is x?
Answers
drwls
(2x-1)(x+5) = 156
That can be rewritten as
2x^2 + 9x - 5 = 156
2x^2 + 9x - 161 = 0
(2x + 23)(x - 7) = 0
Either x = 7 or -23/2 will work.
The answer has to be positive, so it has to be x = 7.
That can be rewritten as
2x^2 + 9x - 5 = 156
2x^2 + 9x - 161 = 0
(2x + 23)(x - 7) = 0
Either x = 7 or -23/2 will work.
The answer has to be positive, so it has to be x = 7.
Anonymous
Thanks