algebra
posted by Jerry .
please help!
The width of a rectangle is 4ft less than the length. The area is 12 ft sq. Find the length and the width.

with : x
length : x+4
x(x+4) = 12
x^2 + 4x  12 = 0
(x+6)(x2) = 0
x = 6 or x = 2
but clearly x has to be positive
so the width is 2 and the length is 6
check: what is 2 times 6 ?