document.write( "Question 421725: When the square of twice a positive number is doubled, the result is 450. What is the original number? \n" ); document.write( "

Algebra.Com's Answer #294436 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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2((2x)^2) = 450
\n" ); document.write( "2(4x^2) = 450
\n" ); document.write( "8x^2 = 450
\n" ); document.write( "x^2 = $\"450%2F8\"$
\n" ); document.write( "x^2 = 56.25
\n" ); document.write( "x = $\"sqrt%2856.25%29\"$
\n" ); document.write( "x = 7.5 is the original number
\n" ); document.write( ":
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\n" ); document.write( "Check:
\n" ); document.write( " 2(2*7.5)^2 =
\n" ); document.write( "2(15^2) =
\n" ); document.write( "2*225 = 450 \n" ); document.write( "

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