Question

The length of a rectangular box is 2 units less than its width.
If the area of the box is 15 units square.
Find the perimeter of the box.

15=w(2-w)

Answer 1

what is the question?

Answer 2

?

Answer 3

Im trying to find the perimeter of that rectangular box. But I need to find out the width first using that formula I gave.

Answer 4

the answer is 16
Explanation
These are the formulas for the box.
A= L x W
P = 2( L + W)
We know that the area is 15
15= L x W
Also,
L= W-2
Now we can use both formulas
(W)(W-2) = 15
W² - 2W= 15
W²- 2W-15= 0
(W-5) (W+3) = 0
W= 5 , W= -3
We can find the Length,
L = W-2 = 5- 2= 3
L= 3
Finally the perimeter:
P = 2( 3+ 5)
P = 2(8)
P= 16