2006 AMC 12A Problem 11

Attempt Problem 11 of the 2006 AMC 12A below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2006 AMC 12A solutions, or check the answer key.

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11.

Which of the following describes the graph of the equation (x+y)2=x2+y2?(x + y)^2 = x^2 + y^2?

the empty set

one point

two lines

a circle

the entire plane

Answer: C
Concepts:algebraic manipulationfactoring
Difficulty rating: 1390
Solution:

Expanding, x2+2xy+y2=x2+y2,x^2 + 2xy + y^2 = x^2 + y^2, so 2xy=0,2xy = 0, i.e. xy=0.xy = 0.

This is the union of the two coordinate axes, a pair of lines.

Thus, the correct answer is C.

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