1986 AIME Problems/Problem 1: Difference between revisions

Revision as of 18:04, 4 July 2013

What is the sum of the solutions to the equation $\sqrt[4]{x} = \frac{12}{7 - \sqrt[4]{x}}$ ?

Let $y = \sqrt[4]{x}$ . Then we have $y(7 - y) = 12$ , or, by simplifying, $y^2 - 7y + 12 = (y - 3)(y - 4) = 0.$

This means that $\sqrt[4]{x} = y = 3$ or $4$ .

Thus the sum of the possible solutions for $x$ is $4^4 + 3^4 = 337$ .

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 == Problem ==
-What is the sum of the solutions to the equation <math>\displaystyle \sqrt[4]{x} = \frac{12}{7 - \sqrt[4]{x}}</math>?
+What is the sum of the solutions to the equation <math>\sqrt[4]{x} = \frac{12}{7 - \sqrt[4]{x}}</math>?
 == Solution ==
@@ Line 16: / Line 16: @@
 * [[American Invitational Mathematics Examination]]
 * [[Mathematics competition resources]]
+{{MAA Notice}}

1986 AIME (Problems • Answer Key • Resources)
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