SOLUTION: A=LW The area of this rectangle is 21 square units. Find its length(the Horizontal side(x-2)) and With(the Vertical side(x+2)).

Algebra ->  Test -> SOLUTION: A=LW The area of this rectangle is 21 square units. Find its length(the Horizontal side(x-2)) and With(the Vertical side(x+2)).       Log On


   

Question 696765: A=LW
The area of this rectangle is 21 square units. Find its length(the Horizontal side(x-2)) and With(the Vertical side(x+2)).
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
A=LW
21=(X-2)(X+2)
21=X^2-4
X^2=21+4
X^2=25
X=SQRT25
X=5 ANS.
L=5-2=3 ANS. FOR THE LENGTH
W=5+2=7 ANS. FOR THE WIDTH.
PROOF:
21=3*7
21=21