Lê Quốc Trần Anh Coordinator
15/08/2017 at 09:40-
\(45+\sqrt{c}=49\)
<=> \(\sqrt{c}=49-45=4\)
<=> c = 16
=> \(c^2-21=16^2-21=16.\left(16-1\right)-5=15.16-5=240-5=235\)
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\(45+\sqrt{c}=49\)
<=> \(\sqrt{c}=49-45=4\)
<=> c = 16
=> \(c^2-21=16^2-21=16.\left(16-1\right)-5=15.16-5=240-5=235\)
Selected by MathYouLike