let's assign the value of x to the width, and the value of 2x to the length, fair enough?

Please note from the problem:

"The length of a rectangle is twice that of its width."

Now, we can plug in these values and solve the equation for x.

A = L * W

78 = x * 2x

78 = 2x2

Divide both sides of your equation by two leaving x2 to itself, okay.

39 = x2

To get rid of th... more

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