Difference between revisions of "1976 AHSME Problems/Problem 27"
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We rewrite each term in the numerator separately: | We rewrite each term in the numerator separately: | ||
<ol style="margin-left: 1.5em;"> | <ol style="margin-left: 1.5em;"> | ||
− | <li>Let <math>\sqrt{a}+\sqrt{b}=\sqrt{3+\sqrt{5}}</math> for some nonnegative rational numbers <math>a</math> and <math>b.</math> We square both sides of this equation, then | + | <li>Let <math>\sqrt{a}+\sqrt{b}=\sqrt{3+\sqrt{5}}</math> for some nonnegative rational numbers <math>a</math> and <math>b.</math> We square both sides of this equation, then rearrange: |
<cmath>\begin{align*} | <cmath>\begin{align*} | ||
a+b+2\sqrt{ab}&=3+\sqrt{5} \\ | a+b+2\sqrt{ab}&=3+\sqrt{5} \\ |
Revision as of 02:45, 8 September 2021
Contents
Problem
If then equals
Solution 1
Let and Clearly, and are both positive.
Note that from which
On the other hand, note that Finally, the answer is
~Someonenumber011 (Fundamental Logic)
~MRENTHUSIASM (Reconstruction)
Solution 2
Let and Clearly, and are both positive.
Note that We rewrite each term in the numerator separately:
- Let for some nonnegative rational numbers and We square both sides of this equation, then rearrange:
It follows that
By inspection, we get Alternatively, we conclude that and are the solutions to the quadratic equation by Vieta's Formulas, in which
Therefore, we obtain
- Similarly, we obtain
Substituting these results into we have On the other hand, we have by the argument of either Solution 1 or Solution 2.
Finally, the answer is
~MRENTHUSIASM
See also
1976 AHSME (Problems • Answer Key • Resources) | ||
Preceded by Problem 26 |
Followed by Problem 28 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 • 27 • 28 • 29 • 30 | ||
All AHSME Problems and Solutions |
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