If x^2 + y^2 = 25 and xy = 12, what is (x + y)^2?
A37
B49
C64
D81
Explanation
(x + y)^2 = x^2 + y^2 + 2xy = 25 + 2(12) = 25 + 24 = 49.
Exam Relevance
- Topic: Algebra
- Subtopic: Identities
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