Question 470543
x^2 +7x-4=0

Find the roots of the equation by quadratic formula							
							
a=	1	b=	7	c=	-4		
							
b^2-4ac=	49	-	16				
b^2-4ac=	65		
{{{sqrt(	65	)}}}=	8.06
{{{x=(-b+-sqrt(b^2-4ac))/(2a)}}}							
{{{x1=(-b+sqrt(b^2-4ac))/(2a)}}}							
x1=(	-7	+	8.06	)/	2		
x1=	0.53		 5/9				
x2=(	-7	-8.06	) /	2			
x2= 	-7.53		-68/9				
Ignore negative value							
x	=	0.53	mph	LCD =		speed	
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