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Lê Quốc Trần Anh Coordinator

15/08/2017 at 09:40
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If 45 + \(\sqrt{c}=49\), what is the value of \(c^2-21\)?




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    Kaya Renger Coordinator 15/08/2017 at 09:57

    \(45+\sqrt{c}=49\)

    <=> \(\sqrt{c}=49-45=4\)

    <=> c = 16

    => \(c^2-21=16^2-21=16.\left(16-1\right)-5=15.16-5=240-5=235\)

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