given P=62 62=2(L+W) divide 2 31=L+W minus W L=31-W
sub into other one A=LW A=(31-W)(W) 228=31W-W^2 times -1 W^2-31W=-228 add 228 both sides W^2-31W+228=0 factor what 2 numbers multiply to get 228 and add to get -31 -19 and -12 (W-19)(W-12)=0 set to zero
