Question

A rectangle has a area of 45 square units.The length is 4 units less than the width.What are the dimensions of the rectangle

Answer 1

A = lw

A= 45 unit²

l= w-4

45= (w-4)w

45=w²-4w

w²-4w-45=0

(w-9)(w+5)=0

w=9, -5 so 9 is the width

l=9-4 =5 is the length