Question 120938
LENGTH=5W+1
AREA=LW
79=(5W+1)W
79=5W^2+W=0
5W^2+W-79=0
USING THE QUADRATIC EQUATION {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} WE GET.
W=(-1+-SQRT[1^2-4*5*-79])/2*5
W=(-1+-SQRT[1+1580])/10
W=(-1+-SQRT1581)/10
W=(-1+-39.76)/10
W=(-1+39.76)/10
W=38.76/10
W=3.876 ANSWER.
W=(-1-39.76)/10
W=-40.76/10
W=-4.076 ANSWER.