document.write( "Question 123224: The area of a circle is {(9y^2 + 78y + 169)pi} square centimeters. What is the diameter of the circle (make sure answer is labeled correctly? \n" ); document.write( "

Algebra.Com's Answer #90547 by Fombitz(32388) $\"\"$ $\"About$

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The area of a circle is equal to,
\n" ); document.write( " $\"A=%28%28pi%29D%5E2%29%2F4\"$
\n" ); document.write( " $\"%28%28pi%29D%5E2%29%2F4=%28pi%29%289y%5E2+%2B+78y+%2B+169%29\"$
\n" ); document.write( " $\"D%5E2=4%289y%5E2+%2B+78y+%2B+169%29\"$
\n" ); document.write( " $\"D%5E2=4%283y%2B13%29%5E2\"$
\n" ); document.write( " $\"D=2%283y%2B13%29\"$ and $\"D=-2%283y%2B13%29\"$ \n" ); document.write( "

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