Question 200210
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The product of the sum and the difference of the same two numbers is always the difference of the first number squared and the second number squared.  In your case:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x^2 - 36 = 189]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x^2 = 225]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x = \pm 15]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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