Question
If six is added to a number and then subtracted from the same number, the product of the sum and the difference is 189
If six is added to a number and then subtracted from the same number, the product of the sum and the difference is 189. what is the number?
Answers
<font face="Garamond" size="+2"> 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^{ipi} + 1 = 0] </font>
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