document.write( "Question 157294This question is from textbook Saxon Algebra 2
\n" ); document.write( ": Find the radius of a cylinder with a height of 8 cm and a surface area of 96(pi)cm^2. \n" ); document.write( "

Algebra.Com's Answer #115928 by jojo14344(1513) $\"\"$ $\"About$

You can put this solution on YOUR website!
Remember: $\"Area%5Bc%5D=2%28pi%29%28r%5E2%29%2B2%28pi%29%28r%29%28h%29\"$ ------> working eqn
\n" ); document.write( "Substitute:
\n" ); document.write( " $\"%2896cm%5E2%29%28pi%29=2%28pi%29%28r%5E2%29%2B2%28pi%29%28r%29%288%29\"$
\n" ); document.write( "

\n" ); document.write( " $\"48=r%5E2%2B8r\"$
\n" ); document.write( " $\"r%5E2%2B8r-48=0\"$ , factor out, perfect square:
\n" ); document.write( " $\"%28r%2B12%29%28r-4%29=0\"$
\n" ); document.write( "2 values: $\"r=-12\"$ ------------> don't use, (-)
\n" ); document.write( " $\"r=4cm\"$ ----------------------> RADIUS, to be used
\n" ); document.write( "In doubt? go back working eqn:
\n" ); document.write( " $\"%2896%29pi=2%28pi%29%284%5E2%29%2B2%28pi%29%284%29%288%29\"$
\n" ); document.write( " $\"%2896%29pi=32%28pi%29%2B64%28pi%29\"$
\n" ); document.write( " $\"%2896%29pi=%2896%29pi\"$
\n" ); document.write( "Thank you,
\n" ); document.write( "Jojo
\n" ); document.write( " \n" ); document.write( "

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