Question 449819
width=x
length = 3x-8

Area = L*W

x(3x-8)=336
3x^2-8x=336
3x^2-8x-336=0

Find the roots of the equation by quadratic formula							
							
a=	3	,b=	-8	,c=	-336		
							
b^2-4ac=64-4032				
b^2-4ac=4096		
{{{sqrt(4096)}}}=64
{{{x=(-b+-sqrt(b^2-4ac))/(2a)}}}							
{{{x1=(-b+sqrt(b^2-4ac))/(2a)}}}							
x1=(8+64)/6		
x1=12						
x2=(8-64)/6			
x2= -9.33						
Ignore negative value	
width = 12
length = 3x-8===>28