Question 355718
Hi,
*Note:  Area is length * width
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let x be the width.  then (3x-1) would be the length
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question states
x(3x-1) = 70
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{{{3x^2 -x - 70 = 0}}}
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solve using the quadratic formula
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
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{{{x = (1 +- sqrt( 841 ))/(6) }}}
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{{{x = (1 +- 29)/(6) }}}

x = 5  and 
x = -28/6 = -14/3 = -4.667