Question 878415
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Area is length times width, so the area, i.e. 70 square feet is equal to *[tex \Large x] times *[tex \Large x\ -\ 3].


*[tex \Large x(x\ -\ 3)\ =\ 70]


*[tex \Large x^2\ -\ 3x\ =\ 70]


*[tex \Large x^2\ -\ 3x\ -\ 70\ =\ 0]


Factor and solve the quadratic.  Hint:  7 plus -10 is -3 and 7 times -10 is -70.


Discard the negative root, since a negative measure of length is absurd in this context.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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