If x 2 + 2xy + y 2 = 81, x + y = A. 7 B.

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If x2 + 2xy + y2 = 81, x + y =

A. 7

B. 8

C. 9

D. 10

E. 11

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McGraw Hills Conquering SAT Math

ISBN: 9780071493413

2nd Edition

Authors: Robert Postman, Ryan Postman

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