Question 473123
width is x
length is x+3
area=length*width
70=x(x+3)
70=x^2+3x
0=x^2+3x-70
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-3 +- sqrt( 9+280 ))/(2) }}} 
{{{x = (-3 +- sqrt( 289 ))/2 }}} 
{{{x = (-3 +- 17)/2 }}} 
measure can't be negative for length and width so we have to go with + option
{{{x = (-3 + 17)/2 }}} 
{{{x = 14/2 }}} 

{{{x = 7 }}} 
so width is 7, then length is 7+3=10