2023 AMC 12A Problems/Problem 23
Contents
[hide]Problem
How many ordered pairs of positive real numbers satisfy the equation
Solution 1: AM-GM Inequality
Using AM-GM on the two terms in each factor on the left, we get
meaning the equality condition must be satisfied. This means
, so we only have
solution.
Solution 2: Sum Of Squares
Equation is equivalent to
where
,
. Therefore
, so
. Hence the answer is
.
Solution 3:
,
let , then it becomes
, or
.
Let , it becomes
,
notice we have , now
(notice we must have
),
,
,
,
and
,
so and
is the only solution.
answer is
~szhangmath
Video Solution
https://youtu.be/bRQ7xBm1hFc ~MathKatana
Video Solution 1 by OmegaLearn
Video Solution by MOP 2024
~r00tsOfUnity
Video Solution
~Steven Chen (Professor Chen Education Palace, www.professorchenedu.com)
See also
2023 AMC 12A (Problems • Answer Key • Resources) | |
Preceded by Problem 22 |
Followed by Problem 24 |
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 | |
All AMC 12 Problems and Solutions |
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