If x^2 – y^2 = 36 and x – y = 4, what is the value of x + y?

A8

B9

C10

D12

Explanation

Algebraic identity: x^2 – y^2 = (x – y)(x + y). Substituting values: 36 = 4 * (x + y) => x + y = 36 / 4 = 9.

Exam Relevance

Topic: Algebra
Subtopic: Algebraic Identities

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