Question 519251
son = x
father = 3x

8 years ago

son = x-8
father = 3x-8

(x-8)(3x-8)=112

3x^2-32x+64=112
3x^2-32x-48=0
Find the roots of the equation by quadratic formula					
					
a=	3	,b=	-32	,c=	-48
					
b^2-4ac=	1024	+	576		
b^2-4ac=	1600				
{{{x=(-b+-sqrt(b^2-4ac))/(2a)}}}					
{{{x1=(-b+sqrt(b^2-4ac))/(2a)}}}					
{{{x1=(-12+21)/(12)}}}					
x1=(	32	+	40	)/	6
x1=	12				
x2=(	32	-40	) /	6	
x2= 	-1.33				
Ignore negative value	

son = 12 yaers
father = 36 years

m.ananth@hotmail.ca