Question 357214
let width be x
length = 6x-11
Area = 21
..
x(6x-11)=21
6x^2-11x=21
6x^2-11x-21=0
6x^2-18x+7x-21=0
6x(x-3)+7(x-3)=0
(x-3)(6x+7)=0
x= 3 cm the width
length = 6x-11
18-11
7 cm the length