As you noted,
l = w+4
Now you only have one more piece of data: the area
a = lw = (w+4)w so,
w^2+4w = 77
w^2+4w-77 = 0
(w+11)(w-7) = 0
w = 7 or -11
Even before working on the algebra, you could have asked yourself, "Self, what are the factors of 77?" 7 and 11.
Hmmm. One is 4 more than the other.
The length of a table is 4m longer than the width. The are is 77m^2. Find the dimensions of the table.
l=w+4
w=l-4?
I'm stuck?
1 answer
1 answer