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A certain number added to its square is 30. Find the number.
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A certain number added to its square is 30. Find the number.
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Oct 16, 2018
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A certain number added to its square is 30. Find the number.
Mathematics
high-school
Mikelbring
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Mikelbring
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I got this:
5²+5=30
For the work, I just took the square I though was closest to 30, and added 5.
Hope this helps!
Peter The Russian
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Oct 18, 2018
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Peter The Russian
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If the number is n, then n²+n=30, so n²+n-30=0=(n+6)(n-5) so there are two answers: 5 and -6.
Ivan Krivyakov
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Oct 20, 2018
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Ivan Krivyakov
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