Areas in diameters

Question

A rectangular garden is 8 ft longer than it is wide. Its area is 609 ft². What are its dimensions?

Answer 1

x(x+8) = 609

x^2 + 8x - 609 = 0

( x + 29 )( x - 21 ) = 0

x-21=0 --> x = 21

21 by 29

Answer 2

x(x+8) = 609

x^2 + 8x - 609 = 0

(x + 29 )(x - 21 ) = 0

x+29=0 results in negative measures

x -21 = 0 ---> x = 21

21 * 29 = 609

rectangle 21 by 29