document.write( "Question 13458: Peter is x years old and his sister is5 years older. If the product of their age is 84 form an equation in x and solve it to find Petr's age.\r
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\n" ); document.write( "\n" ); document.write( "I would really appriciate it if you would assit me in this Thanks.
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Algebra.Com's Answer #6807 by Earlsdon(6294)\"\" \"About 
You can put this solution on YOUR website!
Peter's age = x.
\n" ); document.write( "His sister's age = x+5 \r
\n" ); document.write( "\n" ); document.write( "\"x%28x%2B5%29+=+84\"
\n" ); document.write( "\"x%5E2+%2B+5x+=+84\" Subtract 84 from both sides.
\n" ); document.write( "\"x%5E2+%2B+5x+-+84+=+0\" Solve for x by factoring.
\n" ); document.write( "\"%28x+%2B+12%29%28x+-+7%29+=+0\"
\n" ); document.write( "\"x+=+-12\" Discard, as ages can't be negative.
\n" ); document.write( "\"x+=+7\" Peter's age is 7 years old and his sister is 12 years old.
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