Question 117103
Let W=Width
Then Length,L,=W+2

Area (A)=Length(L) times Width (W) or A=L*W or
168=W(W+2) get rid of parens

168=W^2+2W  subtract 168 from both sides

W^2+2W-168=168-168
W^2+2W-168=0  quadratic in standard form and it can be factored
W+14)(W-12)=0
W+14=0
W=-14 in----------------------------disregard negative Width
and
W-12=0
W=12 in ---------------------------width
L=W+2=12+2=14 in -------------------length

CK
168=12*14
168=168
also
L=W+2
14=12+2
14=14


Hope this helps---ptaylor