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OpenStudy (anonymous):
Simplify: (5 + 2√7)^2 ....... Answer choices: 25 + 4√7, or 53 + 20√7, or 53
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OpenStudy (dumbcow):
FOIL it (5+2sqrt7)(5+2sqrt7) = 25 +10sqrt7+10sqrt7 +28
Parth (parthkohli):
=> 53 + 20sqrt7
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