Question 725483
Length   of	garden		15	m  											
width of  	garden		20	m  											
															
Area =			300		m^2										
Area of 	sidewalk		72	m^2											
length of 	garden	&	sidewalk				15	+	2	x 					
width of	garden	&	sidewalk	20	+	2	x								
															
(	15	+	2	x	)	(	20	+	2	x	)	+	-300	=	72
															
	300	+	30	x	+	40	x	+	4	X^2		+	-300	=	72
	4	X^2		+	70	x	+	-72	=	0					
	Find the roots of the equation by quadratic formula														
	a=	4	b=	70	c=	-72									
	b^2-4ac=	4900	-	-1152											
	b^2-4ac=	6052			{{{sqrt(	6052	)}}}=	77.79							
	{{{x=(-b+-sqrt(b^2-4ac))/(2a)}}}														
	{{{x1=(-b+sqrt(b^2-4ac))/(2a)}}}														
	x1=(	-70	+	77.79	)/	8									
	x1=	0.97													
	x2=(	-70	-77.79	) /	8										
	x2=	-15.5													
	Ignore negative value														
	width of sidewalk =		0.97	m