Problema Solution
The area of a rectangle is 70. If the length is one less than three times the width,find the length and the width.
Answer provided by our tutors
suppose width is x
so length is (3x-1)
the area is 70
so 70 = x(3x-1)
3x2- x -70 =0
（x-5)(3x+14)=0
x=5 or x= -14/3
x is width must > 0
so x = 5
so width is 5 length is 14