(8+2√15/2)(8-2√15/2)
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(a+b)(a-b)=a^2-b^2
(8+2√15/2)(8-2√15/2)=(8^2-(√15/2)^2)
(8+2√15/2)(8-2√15/2)=(64-225/4)
(8+2√15/2)(8-2√15/2)=(256/4-225/4)=31/4=7.75
yapyuanlipdcvui:
sry i make a careless
(a+b)(a-b)=a^2-b^2
(8+2√15/2)(8-2√15/2)=(8^2-(2√15/2)^2)
(8+2√15/2)(8-2√15/2)=(64-4*(15/2))
(8+2√15/2)(8-2√15/2)=(64-30)
(8+2√15/2)(8-2√15/2)=34
(8+2√15/2)(8-2√15/2)=(8^2-(2√15/2)^2)
(8+2√15/2)(8-2√15/2)=(64-4*(15/2))
(8+2√15/2)(8-2√15/2)=(64-30)
(8+2√15/2)(8-2√15/2)=34
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