Question 501488
Let strip width be = x

21-2x will be the length after cutting
4-2x will be the size after cutting

(21-2x)(4-2x)=38

84-42x-8x+4x^2=38
4x^2-50x+46=0

Find the roots of the equation by quadratic formula						
						
a=	4	,b=	-50	,c=	46	
						
b^2-4ac=	2500	+	-736			
b^2-4ac=	1764					
{{{x=(-b+-sqrt(b^2-4ac))/(2a)}}}						
{{{x1=(-b+sqrt(b^2-4ac))/(2a)}}}						
{{{x1=(-12+21)/(12)}}}						
x1=(	50	+	42	)/	8	
x1=	11.5					
x2=(	50	-42	) /	8		
x2= 	1					

logically width = 1 "