The area of a rectangle is 63 sq m. The width is two meters shorter than the length. What is the width?	Pick one
A) 9
B) 7
C) - 9
D) 11
E) 6

Rationale: a = l x w w = l - 2 l = w + 2 a = ( w + 2 ) x w a = w ^ 2 + 2 x w 63 = w ^ 2 + 2 w 0 = w ^ 2 + 2 w - 63 0 = ( w + 9 ) ( w - 7 ) w = - 9 and w = 7 , width can not be negative so w = 7 answer is b
Answer: B