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

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

User Smoe
by
8.5k points

1 Answer

4 votes

Answer: c=110.25

Explanation:


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

User Gerard Brull
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