(√8+√7)whole power is 2
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(√8+√7)^2
;(√8)^2+(√7)^2+2×√8×√7
;8+7+2√56
;15+4√14
is your answer
;(√8)^2+(√7)^2+2×√8×√7
;8+7+2√56
;15+4√14
is your answer
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