Question 211555
LW=AREA
W=L/2-7
L(L/2-7)=160
L^2/2-7L=160
(L^2-14L)/2=160
L^2-14L=160*2
L^2-14L=320
L^2-14L-320=0
{{{L = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
L=(14+-SQRT[-14^2-4*1*-320])/2*1
L=(14+-SQRT[196+1280])/2
L=(14+-SQRT[1476)/2
L=(14+-38.42)/2
L=(14+38.42)/2
L=52.42/2
L=26.21 ANS.
W=26.21/2-7
W=13.105-7
W=6.105 ANS.
PROOF:
26.21*6.105=160
160~160