
Kenneth S. answered 02/02/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Let x = length of rectangle; then width is x-7.
Area is, of course, the product of length times width, i.e. x(x-7).
Set this area to the stated value, getting the quadratic equation x(x-7) = 294.
Solve this equation.