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11-09-2022
Mathematics

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Find the value of c that completes the square.
r^2+21r+c

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smlyons31phasdus smlyons31phasdus

11-09-2022

Answer: 9r2+21r+9=-r2

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sangers1959 sangers1959

11-09-2022

Answer: c=110.25

Step-by-step explanation:

[tex]r^2+21r+c\\r^2+(2)(r)(10.5)+(10.5)^2=\\(r+10,5)^2\\Hence,\\c=(10.5)^2\\c=(10.5)(10.5)\\c=110.25[/tex]

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