document.write( "Question 1040785: A number is twice another number and the sum of their squares is 80. Find the numbers. \n" ); document.write( "

Algebra.Com's Answer #655690 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "x = 2y,\r\n" );
document.write( "x^2 + y^2 = 80.\r\n" );
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document.write( "--->\r\n" );
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document.write( "4y^2 + y^2 = 80  -->   5y^2 = 80  -->  y^2 = 80/5 = 16  -->  y = +/-4.\r\n" );
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document.write( "y = +-2.\r\n" );
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document.write( "Answer:  The numbers are  4 and 8  or  -4 and -8.\r\n" );
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