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

asked Nov 10, 2023 215k views

2 votes

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

by Smoe

4.5k points

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4 votes

Answer: c=110.25

Explanation:

$r^2+21r+c\\r^2+(2)(r)(10.5)+(10.5)^2=\\(r+10,5)^2\\Hence,\\c=(10.5)^2\\c=(10.5)(10.5)\\c=110.25$

Gerard Brull answered Nov 15, 2023

4.3k points

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